Grobbulus has one alliance guild (who has cleared Naxx and continuing to focus raids on it) and one horde guild (who’s working on BWL progression). Theres more info here. We are a micro population server but we enjoy it that way. Both sides are very active in the context of guild versus guild server.
Given your reply above about rebuilding though, check out Deviate Delight (RP PvP). They started a “fresh” reroll campaign in March and have something like a few thousand players and numerous guilds. Their goal was to repopulate a dead server, where as on Grobb we actively aren’t looking for that and just want to maintain our small town micro vibe.
Nothing wrong with either one, just articulating differences so you can make an informed pick.