Good luck! In relation to your talk of "MMO server experience", the community as it stands seems to prefer gated communities of lightly-modded vanilla above all, which frankly is a testament to the quality of the core gameplay loop
and to the type of player who particularly enjoys it. It's interesting that minigame and gamemode servers have, thus far, not managed to gain a foothold.
Civilization servers of various types have lived and died,
as have servers with interesting (though not always fun) gimmicks or server settings, but I have never in all my days seen a minigame server. I probably just missed its coming and going, if it ever came and went at all. I've also never seen hide nor hair of adventure maps, let alone servers that host them on rotation. If I'm ignorant on any of these servers, or if you or anyone else knows an interesting type of server that strays from good 'ol vanilla, I'd be very curious to hear about it.