Well, I'm going to be in a Pathfinder game next week as a player. A buddy of mine is wanting to run it, and asked me to play. I have reservations about it- 3e was by far my least favorite version of D&D, and after buying the Pathfinder book and giving it a readthrough, I don't see improvements on many of the core issues I had with 3e. Nevertheless, the guy is a good DM, and I'll give it a shot.
Going back to 3e though is something I don't think I could stomach. It jarred so badly with my playstyle and DMing style that I never truly enjoyed the system. I enjoy simulationism in a game, and while 3e supposedly was "more simulationist", we found it to just be wonky, with very little internal consistency and weird gameplay issues we haven't had with any other editions of D&D before or since. From about 2005 until 4e was released, we swore off 3.x D&D and instead branched out and played other games we really enjoyed (WHFRP2, Savage Worlds, NWoD, Dark Heresy, Kult).
However, my groups and I still revisit AD&D 1e/2e a couple times a year, with no problems. NWPs don't really bother me, but then again those games tend to be one-time games rather than long-running games. I don't recall ever having problems when running 1e/2e with being frustrated with the system- although the caster power level disparity bugged me, it also took a LOT more XP to level up for them. However, 4e is just so much better than the previous versions of D&D for my groups, that I can't imagine really going back to run a long-term D&D game with any other system. We've even gotten the 1e "dark and brutal" feel back by limiting healing surges somewhat (only regain 3 HS per extended rest, and HS only bestow back 1d8/1d10/1d12+Con mod hp per use in heroic/paragon/epic tiers), and my players LOVE it.
So yeah, for my groups 3e was definitely the needy, clingy, jealous, psycho ex-gf Barastrondo mentioned in his post.

It still is referred to in our groups as "the edition that shall not be named".