I don't know about anyone else on the forums, but. Minecraft SMP just hasn't felt the same in so long, I miss it. I look daily to find maybe sometime I'll find an active pure vanilla smp server, something with a fun community that loves the game, good moderators, no strange plugins that add nothing to the game. I miss it, I just want a server to play on.
Many people go to the 'looking for someone to play' forum or server threads that advertise but I won't deny that many might be HermitCraft like, Economy like or otherwise. Or people have just moved on from the game.
I don't play on servers often (or Vanilla even as I'm more into mods or datapacks, that and I'm more a singplayer type) but there probably is some out there it just depends on where you look, whether on these forums or on other sites that host their server details, or list servers you could try out.
Almost no servers I can think of are completley vanilla , and I've done a lot of looking, closest I can find is a server I current play on that's almost completely vanilla and only has a few things like an economy (which we supplement with diamonds since the server only just added it), some greifing prevention things, and extra worlds for other stuff like resource gathering if you're interested? As far as I know, it's pretty vanilla and the community's pretty good and clean, long as you don't mind being the only one online half the time at the current time (it's quite active during holidays and things though)
(Honostly the only weird plugin I can think of would be the one for sleeping, but I think it was removed because it was just one big annoyance XD)