2e came out just as I was starting college. Both myself and a new friend went to buy the 2e PHB the day it came out and got the first two copies our FLGS sold. We immediately (I mean, a few days later) started a game. All my old friends (well, nigh-all, anyhow) were gone by that time- so all the 1e pcs became background characters.
One thing about 'the switch'- it was much
easier to switch to 2e. I didn't have to restat anything, really, unless it was a cleric, assassin or monk.

But the switch to 3e requires extensive rewriting of the campaign's fundamentals (especially religion, or at least the way clerics work, but also including
every npc- none of them had feats before!). I think a lot of teh hat for 2e comes from
how much of an improvement 3e was over it. If 1e was a nice blt, 2e took off the mayo, added cheese and switched the butter lettuce for iceberg. Different, but not too much; different enough to annoy a lot of people but similar enough to sway them despite that. But- continuing the metaphor- 3e threw out the blt entirely in favor of something on a toasted sesame seed roll, with a delicious spicy chicken patty, entirely different fixin's and a heavy dose of onions as well! It's pretty far from the original sandwich, but it's still a sandwich.
In retrospect, the one thing I think 3e should have taken more of from 2e was specializing the clerics. I understand the philosophy behind the return to a 'main spell list' type of class, but I wish they'd done it differently- with many more domains per cleric and far fewer spells on the 'base list.' Yes, it would be tricky to balance; isn't the whole system?
