I played since 2004 (yes, when original WoW released) until I quit in 2005 when I hit 60, because I was intimidated by the whole prospect of Raids, pvp rank grinding (back then) etc.

I rejoined recently (August 2008) and have had more fun ever since, especially if I don't have the goal of being uber / epicced. I just enjoy the game as it is, trying to have 1 character from every class at 80 thanks to RAF bonus, occasionally running heroics with RL friends and then talking about the bad tank or that huntard via private tells lol.... it's fun if you've taken a break