At lv 60 I trust my tanks, so with big pulls it's divine seal + regen + medica II. Pop Asylum if needed. I do that a lot with Lost city (hard) butterfly wall. And then I tend to swiftcast first holy only for the stun effect, because the tank will have all the mobs smacking them and the quicker I prevent that the better while regen effects patches tank's HP bar. Next I cast aeroIII with the "down time" of mobs being stunned. Then holy again, assize, holy until full resist and depending on the dps, at that point mobs are below 50% of health and dropping quick. Rest is keeping the tank alive and when there's about 3 mobs left, which usually happens quite quick, it's just stoneIII. Sure I burn MP, and rarely I manage to get full mp before bosses, but at least I'm not bored.