Oh yeah, the thing I appreciate most about 2e were the campaign settings. 3e was also pretty great in that regard, but without quite the variety.

To take the rose-tinted glasses off for a bit... yeah, I would rather play mechanically better games. I might dip into 2e or 3e for a short adventure, but if I want to do a campaign, I'd look elsewhere. There are systems that do old-school D&D better, modern D&D better, and other things entirely. Speaking of Planescape, I was thinking of running something like Blades in the Dark, set in Sigil.