I'd been trying to get off WoW after re-subscribing for the 2nd time last january and after so much hardship, I finally managed to do it.
The secret is to log onto a free server and play it for 45 minutes. I guarantee that within that time you'll reach 70, have full epic gear/mount and be running Black Temple. After seeing what the game is at the end really destroys the illusion of it. Makes you realize just how much time you've wasted going from 1-70 and running the same instance 14 times for a gear-drop.
For further reading, I'd suggest anything off of http://www.wowdetox.com
If anyone has any advice, please add to the thread. You might save a life!