I'm still playing (well, DMing 95% of the time) D&D3 without any major changes, and enjoying it a lot.
However I also play other games, and have always done. I had a long period when I never played D&D (the whole 2E period, in fact) but only other RPGs and (non-GW) miniature games.
But when I play other RPGs these days I prefer them to be non-d20, to get some variation, like Unknown Armies, Hârn, HeroQuest, etc.
[Edit] Oh, kilopost!