The days of the week go: Sunday, Monday, Patchday, UI-Fixday, Thursday, Friday, Saturday
For me before DA quit raiding that would be: Raidday Raidday Patchday UIFix Day Late-UI-Fix-then-Raid-More-Day DayIDontPlay QuestAllAfternoon&EveningDay...lol

You're non-gaming friends or family ask you what's new and you have nothing to say to them that is not WoW related.
Sad part is this's true...I've got little to say irl(you wouldn't think it here) cuz of that ;p Nothing else important really happens lol

My "You know you mbox too much" submission:
You know you multibox too much when, while simply chatting in IRC or while playing any non-boxing game, you keep habitually hitting the Pause key before chatting. I think my record is like 6 times in a row while talking in IRC and randomly thereafter after a particularly long afternoon of questing lol

And since SOMEONE WILL EVENTUALLY SAY IT!
You know you game too much when you make a "You know you game too much when..." thread ;) It happens in EVERY "You know you..." thread of any game ever.