I’m a little surprised I am still playing EVE Online. It’s a really good game and I am surprised at the size and available options it presents. If you like massivly multiplayer games, I think you should feel obligated to try EVE. Many aspects of the game remind me of my old days playing MUSHes and MUDs.
I think that moderate playing has contributed to my enjoyment. Taking it slow, in a decent corporation, with no pressure to race ahead. This type of playing is augmented by the method EVE uses to train skills. My character learns new things over time, even when I am offline. It means my time spent not playing is more valuable than most other games I am not playing.