Glyph of Rejuvenation is awesome for pets-- boosts healing of rejuv another 50% when the target is below half health, which is when you need it the most. Combined with all the extra +Heal% that talented pets get, rejuv can give a LOT of health to a pet. I think of it as life insurance. Glyphed regrowth is also nice, it gives another 20% to a regrowth if there's a regrowth HoT still active on the target. A properly talented regrowth crits a TON, which also procs a reactive heal on the target... There's just a lot of synergy...

IF the target can avoid being 1-2 shotted. That's the main concern. I think with some gear and proper Roar of Sacrifice chaining, my pet crew will become beefy enough to tank bosses without too much worry. We'll see.

Pretty much the only significant advantage that priests have over druids for healing a hunter multiboxer setup is Fortitude. Unless changes are made, Wild Growth heals more per application than Circle of Healing, and it's HoT ability is actually useful in boss encounters because you can pre-apply some healing to people you know will get AoEd. On the whole, they are very equivalent, but I prefer the druid style after having spent the last 10 levels appreciating how much forgiveness HoTs give the pets.

It stinks that Pallies don't have decent AoE healing capability. The only interesting pally mechanic that might be worth exploiting is their Beacon of Light ability for boss fights. Using Roar of Sacrifice, you could ensure that a second pet is always taking some of the tank's damage, and now have two targets that are soaking damage-- an ideal situation for how Beacon works.

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My current healing strategy as a druid is...

Keep Rejuv up on anything that has aggro. (Life Insurance)
Regrowth spam on any target that is taking significant damage
Wild Growth on either the pet group or the huntard group every 6 seconds

I don't roll lifeblooms too much during trash, because I generally just let the pets have a free-for-all and duke it out for aggro. Wild Growth is awesome for dealing with this bouncing aggro. Lifeblooms are employed only on boss fights when I try to keep aggro on a single hunter pet.

For the last three weeks, I have pretended that WG already has a 6 second cooldown, and I will not re-use it while it is still ticking on anyone. I don't think the nerf will impact my playstyle much as a result.