I got bored twice.

First time, I stopped for about 3 months, and came back for BC. I dual-boxed the content, levelled some alts, and got bored again.

Second time, I stopped for over 6 months, and came back for WotLK. My goal is to see end content for the first time. I'm not there yet (my highest group is level 77), but being able to actually do instances is a blast. If I get bored, I will stop playing again, but that's not for tomorow, too many things to do, to many places to visit and challenges to tackle. I stopped doing PUGs during the first year of WoW, and will never go back to that. Playing 5 characters opens so much content it's almost scary
Very happy gamer here.

If you are bored, take a break, and come back later, or not.