Wow i did not expect to find this thread on first page after getting back from vacation. >.>
Anyways I've been playing Destruction again since cata came out. I tried the haste reforge Demonology few weeks ago and my guilds loved it and i was pulling a few higher numbers with it. I'm giving a few more shots. But will keep Destruction as a os if i do go demon i just love it.
Mainly use destro with off spec demo for old man rhyolith, and other times when heavy aoe is needed or when I feel like like it. Used destro for most of T11, so have just gotten use to the rotation. Also BoH is useful for the fire bird since we have a good shadow priest flying around in our 10-man, spider betty after the second mass aoe fire thing up top, and then for shannox putting it on riplimb when we have downed rageface and are dpsing shannox down to ~35% since it makes the fight a little shorter. To each there own it all depends on how you would want to play.