For me, once i get burned out on a particular aspect, I just do another aspect. I bounce between PvP boxing, PvE boxing, solo PvE raiding, leveling alts, getting professions ready for cataclysm, playing the AH game etc etc. If you don't want to "work" at the game, then take a break for a while. It's a game, its supposed to be fun, not a chore.