I, too, am addicted, but I've easily been able to walk away. After reaching 60 with a Druid on Blackrock, I stopped playing for months, apart from an hour or two every week. Now I've started playing again with a 46 Warrior on Silvermoon.
It's my first MMORPG so I can't really compare it, but I will say that it's a great game, bar the server problems that plague people from time to time.