Well, I find any game boring when I beat it. I couldn't even stomach completing SOA/TOB all the way through the second time, and that was one of my all-time faves.
So, if you aren't raiding, then you have effectively "beaten" the game of WoW. You can re-do the same dungeons for the odd piece of gear you need, but of course you're frustrated.
If I had finished all the raid instances, I'd feel the same way.
And quitting until October when the xpac drops is not exactly a long "hiatus." Take a break. Come back when you can level to 70 and socket your armor.
__________________

|