Careful Jory lol, I recently quit WoW (February '10) and have never logged back in. Was lvl 80 in a top 100 raiding guild, and it will seriously ruin your life hahaha. I was raiding 6-7hrs a day, 5 sometimes 6 days a week.
My advice is to not get too addicted (which is very difficult. I've never regretted quitting, really glad i did. Being able to go out and about again lol. For 2 yrs all i did was eat and sleep (when i could), work, WoW... repeat.
And trust me, once you hit 80 you won't wanna quit. You'll want to raid/pug, because you don't actually 'experience' the game until you start raiding current content.