Eh, most of them are dead or were made for a one-off joke. If you were to pare it down to active subreddits with any real community it'd drop to ~30. And if you were to removed subs from that list that were stupid and require no moderation (like /r/catseatingpasta) then it'd probably be closer to 20. It's really manageable, especially since I don't mod any of those subs by myself. 