After goofing around with this on a Paladin led team of Mages and a Priest, I can say that the easiest use I've found so far is to gather a shit-ton of mobs with Pally (rank 1 consecrate, running like mad) then huddle up and just bring the Blizzards & max rank Consecrate or Holy Wrath down on top of your self using the simple minimap location of (0, 0)

I was trying to call AoEs by pinging the map with the Pally but even the slightest bit off will put AoEs off to the side etc. Just my 2cp.

Be sure to use [nochanneling] in your Blizzards, etc by the way.

Also, for Frost Mages, try:

Code:
#showtooltip 
/cast Summon Water Elemental 
/cast Freeze 
/run MinimapingLocation(0, 0) 
/petaggressive
the aggressive part is up to you, but I find he is such a short duration and you've got 20 mobs in a pack it usually won't cause any problems with him taking off on you. This pops pet and uses his Nova to AE the cluster, then he gets down to biznass. Since I've got wicked agro with my Pally I'm not concerned with Freezing mobs on top of myself as the Mages, in fact I want Chills/freezes for hella crits =)

This new find has greatly increased AoE grinding for me. Replacing Arc Explosion with Blizzard is huge now that it can be effectively done. Better mana/spellpower usage.

Another side note for the Pally. I know I might be going over old news, but since I didn't bother to do any AoE grinding really as a multiboxer and now am... be sure to use Gift of Arthas pots, and get Crystal Spire gems from Un'Goro, as well as Shield Spikes (duh). Anything you can add for reactive dmg is huge.

Anywho, I'm rambling - have fun!