Currently on my Priest, PvP. Got burnt out on raiding in Tier 11.
Sometimes Heroics with friends, Perhaps the occasional raid.
Arenas, Rated Battlegrounds, and Random Battlegrounds (ONLY for gear/enchants)
Having to spend like 4+ global cooldowns (as Shadow) to rebuff after rezzing is about the only one I can think of.
LEAP OF FAITH! (My Priest's name is even Lifegrip ^_^ ) Penance, Prayer of Mending, Mass Dispel, Divine Aegis, Shadow Word: Death, and Power Word: Shield.
No real +mana cooldown for Disc in PvP, all we have is Shadowfiend (4+ min CD) and Hymn of Hope (5 min CD) unless I'm forgetting something (I don't consider Rapture (talent) as a mana cooldown). Getting trained by a DK who knows how to press Necrotic Strike.
Well, PvP isn't so much rotation, but as far as how everything plays out, I feel it's in a good spot.
A "Divine Plea" type spell for Priests. Something like Innervate or the like. Shorter CD for Shadowfiend. Divine Hymn needs some love (for PvP and PvE).
Mind Vision (But I still like it!), Shackle Undead (still like this too). Mind Soothe (I would like a change to this spell, so it actually finds a place on my bars.)