I apologize for my sarcasm, but I'm in a strange way today.

There are these nifty little things in the game.... I think they call them quests?

But seriously, with the 2.3 changes questing is amazing. With multiple mages you can just AoE grind on your way to do various quests. you would burn through the levels, but really wouldn't have the ability to do instances.

However, if you wanted to still go the AoE route, why not slap in a prot pally for tanking and consecrate, 3 mages, and a holy priest for prayer of healing and crcle of healing? That way you could still "solo" instances and have all of that AoE goodness.