WoW...for now. At one point I had 3 subscriptions - World of Warcraft, Everquest 2 and Lord of the Rings Online. EQ2 fell by the wayside again and recently I all but forgot I had a LOTRO subscription!
Picking one game is a good thing. By playing alts again, I've found myself with more than enough stuff to do. To the point I'm going to have to set some limits, as always it is easy to get caught up in all there is you can do. I know a guildmate who has a notebook to keep track of things. My and a friend were discussing how it would be nice to have a mod that reminded you of all the things you need to keep track of. I have fun with many of the things I have to do, but some of it is so much busy work. Either way there is not, and should not, be enough hours in the day for WoW and 2 other games.
So I'm playing Playerunknown's Battleground
9 hours ago