The great tragedy of healing is that the better your team gets, the more boring it becomes. It’s been said many times that while DPS can strive for bigger and better results on farm bosses, healers just see their numbers dwindle. Easy farm content leads to boredom, and in my guild bored healers lead to trouble. All of us enjoy the crazy chaotic fights with lots of running and stuff to do. Healychat after the first couple of Festergut wipes read like wide-eyed kids in a candy store: “Did you see that? There’s so much raid damage. It’s .. it’s AWESOME.”
This is particularly applicable to LFG pugs at the moment. Given a halfway decent tank, I can get away with Prayer of Mending and a shield or two, leaving me to space out and spin around in my chair for half the instance. So what’s an overgeared healer to do? SMITE!
I know a lot of healers queue up with DPS gear and specs now to help out with damage, but I’m not that brave. I burn through mana really quickly in my shadow set, and my hotbars and keybindings are all wrong for the kind of panicked “oh shit” healing that might be required. Besides, you never know how good your next Heroic tank will be. Instead, I like playing the Battle Priest, Smiter Extraordinaire. I’ve beaten DPS on many a pull, which is vastly more entertaining than dancing in the back of the room.
The secret to healer dps is this macro, which you probably already have in use somewhere:
/cast [harm,nodead][target=targettarget,harm,nodead] SpellName
Set up all your offensive spells to use this macro. Now you can DPS a mob without ever leaving your friendly target — instead it will hit your target of target. I use this to pop shadow word: pain, devouring plague, and shadow word: death on a boss as much as possible (assuming you can give up the GCDs). Hey, every bit helps, and I’m pretty sure my 200 DPS on Rotface was what put us over the top. Totally.
Anyway, this can be used with smite too, which is your friend on pugs. Throw SW:P on anything, and pop devouring plague and SW:D on the big baddie. Is there a single target? PoM and shield your tank, and Smite away! Is it a pack pull? Oh, you lucky dog, it’s MIND SEAR time. I love mind sear. I love it so much. All the tanks in my guild can testify to my love of mind sear, as it’s killed them each at least once. (What? I can’t stop and heal you, I’m clearly MIND SEARING. Duh.)
It helps to have a bit of +hit. I have 70 incidentally from a wand and offhand in my main gearset, which is good enough for me. The hit cap for Heroic bosses is about 130 for Alliance and 160 for Horde, not that it’s a huge concern.
A well geared healy priest can easily pull down 1-2k DPS during a Heroic (again, assuming a good tank), which means that you will clear the instance that much faster. Being a Heroic Battle Priest and occasionally beating Mr. Mouthy Noob Hunter on the charts has made LFG much, much more fun.
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Fitzcairn’s Macro Explain-o-matic: Feed it a WoW macro, and it will explain what the heck is going on in those many square brackets. Oh, clever website!

Hey liore, long time no see… turned goat-lady, eh? me too :p
It's nice that over time priests and other healers have gotten more options for dpsing while they're healing, because you're right, it does tend to get boring after awhile. When I used to heal and I got a great tank, I'd just sit there with renew and PWS and I'd be falling asleep. Now at least we can help out a bit making the run go faster. =) I almost like the old BC heroics better because of the damage, but they tended to be, to put it lightly, god-awfully slow. Anyway good luck in your WoWing.
-Selmarita