I always wondered how guys get bored of the game and quit ^^.
I've been playing since patch 1.2. Started on US, made an undead warlock, played for a while at 60 but got fed up with never being able to progress endgame because of the time zone difference. Moved over to EU, made an undead warlock and have been happy ever since. If you have an active endgame guild, you never run out of things to do.
How entertaining life is at 60, or more, how long life is entertaining at 60 is almost completely determined by your guild.