Aberzanzorax
Hero
Knifiespoonie and Terradave bring up another interesting point...yes people will always quibble about small things, or large things, or really anything. 
However, I'd also propose that the degree to which such a change (and of these...Chevy versus Ford, etc) matters is entirely dependent upon investment.
Investment, as I'm using it, can mean multiple things:
*Investment in terms of dollars spent (how many 3e books does one own).
*Investment in terms of how many dollars one even HAS relative to those spent (If uber rich, you might not miss $3,000 spend on out-of-edition D&D books).
*Investment in terms of career and perhaps career dreams (paid and unpaid, and realistic and unrealistic). E.G. If I write for 3e and don't like 4e, that's a big hit (or moderate ENworld and no longer like the current edition). If I even (however unrealistically) think I'll write for D&D in the future and the rules change to something new that I don't like/understand/feel I can't write for...then that's a blow.
And now the MORE important investments:
*Investment in D&D as time spent. D&D involves building up a character and story over many, many sessions...sometimes over years or even decades. To lose that investment, is to lose quite a bit.
*Investment in D&D as emotion spent. Maybe I love a specific character who "just wouldn't be the same" in a different edition. Maybe I love the ruleset for something it achieves that the new set doesn't (gamist versus simulationist rulesets for example). Maybe it IS just familiarity. Familiar is comfortable and a comfortable fun activity isn't often somethine people want to leave behind. Here, I'm thinking of "The Little Prince" where, and I may get this wrong, the prince comes to love a friend (maybe a fox?). It is just a fox (just as my dog is just a dog). However, the time spent and shared experiences create an emotional bond that makes that fox (my dog) special. Depending on people's experiences, a ruleset, a specific character, a campaign, or even a group (where some people want a given game and others don't) can become special. That's a lot of emotional investment to give up.
In the end, I wonder if people who state that "edition warriors" are just arguing about small things had as much "invested" as did the "Edition warriors" themselves. I don't deny there are some who like to "stir the pot" as trolls...or just like to argue. But, as you've astutely pointed out, there is something a bit more about D&D than, say, pepsi versus coke. I think to many who come back to these kinds of discussions again and again, they do not consider these to be small things.
Edit to add:
If you're looking for some particularly egregious instances, just go back to the locked threads here...especially those after the announcement of 4e and the release of 4e. Also, go to the WOTC forums. At the bottom of the page they (used to or may still) have the forum for the transition of the editions.
It might be particularly interesting data for you to read through these two time periods (the anticipatory change and then the actual release and reaction).

However, I'd also propose that the degree to which such a change (and of these...Chevy versus Ford, etc) matters is entirely dependent upon investment.
Investment, as I'm using it, can mean multiple things:
*Investment in terms of dollars spent (how many 3e books does one own).
*Investment in terms of how many dollars one even HAS relative to those spent (If uber rich, you might not miss $3,000 spend on out-of-edition D&D books).
*Investment in terms of career and perhaps career dreams (paid and unpaid, and realistic and unrealistic). E.G. If I write for 3e and don't like 4e, that's a big hit (or moderate ENworld and no longer like the current edition). If I even (however unrealistically) think I'll write for D&D in the future and the rules change to something new that I don't like/understand/feel I can't write for...then that's a blow.
And now the MORE important investments:
*Investment in D&D as time spent. D&D involves building up a character and story over many, many sessions...sometimes over years or even decades. To lose that investment, is to lose quite a bit.
*Investment in D&D as emotion spent. Maybe I love a specific character who "just wouldn't be the same" in a different edition. Maybe I love the ruleset for something it achieves that the new set doesn't (gamist versus simulationist rulesets for example). Maybe it IS just familiarity. Familiar is comfortable and a comfortable fun activity isn't often somethine people want to leave behind. Here, I'm thinking of "The Little Prince" where, and I may get this wrong, the prince comes to love a friend (maybe a fox?). It is just a fox (just as my dog is just a dog). However, the time spent and shared experiences create an emotional bond that makes that fox (my dog) special. Depending on people's experiences, a ruleset, a specific character, a campaign, or even a group (where some people want a given game and others don't) can become special. That's a lot of emotional investment to give up.
In the end, I wonder if people who state that "edition warriors" are just arguing about small things had as much "invested" as did the "Edition warriors" themselves. I don't deny there are some who like to "stir the pot" as trolls...or just like to argue. But, as you've astutely pointed out, there is something a bit more about D&D than, say, pepsi versus coke. I think to many who come back to these kinds of discussions again and again, they do not consider these to be small things.
Edit to add:
If you're looking for some particularly egregious instances, just go back to the locked threads here...especially those after the announcement of 4e and the release of 4e. Also, go to the WOTC forums. At the bottom of the page they (used to or may still) have the forum for the transition of the editions.
It might be particularly interesting data for you to read through these two time periods (the anticipatory change and then the actual release and reaction).
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