Erm... considering the huge chunks of experience you get from turning in quests now, why would you AoE grind except for giggles? Slowest possible way to level, even as a Prot. Good practice for dungeons I suppose, but other than that a waste of time unless you are AoE grinding mobs you need to kill for a quest anyway.
With the new patch, use seal of light which only needs to be renewed every 2 minutes, and judge wisdom periodically, which does NOT consume seal of light. You won't ever run out of health or mana.
Using line of sight to make caster groups come to you and get within your melee range is also SUPER IMPORTANT! If you are fighting caster groups use fire resist/frost resist/shadow resist auras depending on what the caster mobs are doing to you.
If you are only fighting melee mobs, use Devo Aura and other than seal of light and judgement of wisdom, Blessing of Sanctuary and consecrate, consecrate, consectrate as they beat themselves to death on you.
If you can't kill 8-12 non-caster mobs that are the same level (and non-elite) as you and still have at least 50% of your health and mana by the end of the fight after the latest patch changes, either your equipment sucks or your talents are set up wrong, or both, but it sounds like what you are doing should be fine for the most part, especially with the new patch changes!
Edited, Oct 15th 2008 8:41am by jeromesimina