Hiya!
Oh, I was right with you and agreeing up until the postscript ....
You like a lot of the Unearthed Arcana stuff?????
You loved both the DSG and WSG?????
That's like saying, "Dude, Paladins are awesome, and can only be awesomer if they are gnomes." NEVER!
(IMO, UA was undoubtedly the low-point for 1e and, unfortunately, Gygax- foreshadowing his post-TSR issues, and WSG and DSG, along with WG7, pretty much was the end of my desire to purchase TSR output).
Ok, ok...I know I'll never be able to douse the unquenchable hatred-fueled hell-fire that burns in your soul against Paladins and Gnomes (n.b., Paladin is tied with MU's for my favourite class...just saying...

), so I won't bother. However, in regards to WSG/DSG/UA...
UA had a lot of interesting stuff. Some was way over the top (Method V stat rolling, the Grey Dwarf, and the Deep Gnome, for example, but Drow weren't too bad, due to the fact they were semi-'known' and hated by pretty much everyone in existence). I tweeked a few things (like making two types of Paladins; PHB Paladins and Paladin-Cavaliers...but so far I've only seen TWO played since UA has come out; stat requirements and other strictures are just REALLY REALLY harsh), but overall we used a lot of UA, most in fact. The update to Druids and all that had a HUGE impact on my Greyhawk campaign and any Greyhawk campaign/games I run to this day.
The WSG and DSG...I use for 1e and I use for many other fantasy games (if it's some kind of "D&D", I'm using them 99% of the time). The info presented in the books made me think of things I hadn't really put a lot of thought into. Like air quality and temperature. Or different types of watercraft that PC's are far more likely to build/find/use. The info on detection of odor's, and chances to climb, or how small an area a particular PC can squeeze into, etc. The weather effects on missile weapons, movement, climbing and all that. Chances of hunting or fishing. Swimming, drowning, quicksand, rockslides, beasts of burden, and all the overall "info" about terrain and 'the wilderness'. How can you NOT love this stuff?
Then again, I'm a DM that doesn't "build to the PC's", so all the info in these books I use to help bring the world to life and glue it all together with a consistency that allows my players to make decent guesses on, well, a huge range of things. I have found that using the GUIDELINES presented in all three of those books, UA, DSG, WSG, I've been able to maintain a consistent 'style' of DM'ing over the decades. Probably one reason why when I get a new player, they tend to stick around for a decade or three. My players know that if they are going into the mountains, they know what to bring and what not to bring...in stead of just taking "whatever gives the best Survival bonus", because I run an Old Skool style game where if a player just blurts out "I make a camp for the night" and that's it...well...it could be very bad for that PC. I will take the absolute BASE decisions made from the perspective of a Commoner. So players don't say such simple things; they actually describe what and how they are setting up camp and what precautions they are taking, etc. Then, using the info in the WSG/DSG, I can figure out how effective their 'camp' is at keeping them safe, healthy and alive. "I make a camp for the night" is basically a Player giving me carte-blanche to play the part of Unforgiving Mother Nature. Mother Nature don't give a shpoop about your intentions or feelings...it only cares that you decided to sleep in your metal armour, on the ground, in a depression, with no fire because you didn't want to "attract attention". Ok, PC, welcome to the "hypothermia" rules, population, YOU.

Oh? That's unfair of me as DM? Huh...well maybe NEXT TIME you will actually think about what YOU would do if you were your PC and in that situation, and then take two minutes of your time telling me how you are going to avoid not dieing. There's more to the game than just Combat and making a Skill check!
...er...sorry... got a bit heated there...

I figure if I put effort into thinking about the world and making it feel "real" to the player, then the players should at least have the decency to put a bit of effort into thinking about the world from the perspective of their PC as a person in the fantasy world rather than just a few numbers on a character sheet. Thankfully, my players do!
PS: Take your loathing of Paladins/Gnomes and just sub-in 'WG7' and you know how I feel about that...that...abomination!
^_^
Paul L. Ming