I go for quest wants on my mages/priest team.
and wow!

Hit a mob with low rank frost bolt, wand once or twice, dead and I have full mana. Leaves me with mana to go AoE an entire area
I've just found out with my mages I can bubble my main mage, agro everything in an area and then find a wall to run behind (so I don't get casters/ranged sitting way off) and just go nuts with arcane spam. May respec them arcane so it does more damage for less cost, but wow is it the lazy way of clearing areas