Granted, Karazhan has been nerfed, and our group is way overgeared for it...
... but Discipline Priest is fun. And has good utility!
Now, when the dual-spec ability becomes available, maybe I'll do something else, but for right now, Disc gives me the utility that I want.
A holy paladin, for the most part, can't DPS. A holy priest, for the most part, can't DPS. A discipline priest can heal when healing is required and DPS when healing is not required.
Granted, I will not be putting out the numbers that a Shadow Priest can put out, but if there isn't a need for two healers at the moment... I can push 400 DPS, and that's with probably a crappy rotation and I know for a fact that I wasn't chain-casting. Imagine what I could do if I actually tried?
The things about Disc that I'm enjoying... the mana regen. Nummy nummy mana regen. I get mana back when I heal. I get mana back when I shield. I use less mana when I cast. I have more mana total. I get more mana back when casting. With the disappearance of downranking (I used to downrank alllllllll the time. I never ran out of mana, but that was because I healed you for just as much as you needed, and barely a whit more. Was I always casting? Yes. But I was efficient, damnit! Now I either overheal, or wait until you drop 4-5k health before I cast. Actually... I've started to dance. I start a heal... esc. Start a heal... esc. Until it's time to let the heal actual go through. Oy.) this is a yummy yummy aspect to Discipline that I'm getting a kick out of. I still don't have mana issues. Which the mana issue wasn't as big of a deal as people were crying it would be, but I'm still happy to see my mp5 while not casting is 800+ buffed, and 300 when casting buffed. (500/someothernumber notcasting/casting unbuffed). It makes for a happy priest.
I don't have my priest loaded right now, so I can't give particulars, but I have a threat reduction that can be applied not only to any person in the party/raid, but also then reduces the damage that person takes. Pain Suppression, iirc. (And it's too late for me to go linking things, sorry.)
My improved divine spirit not only increases your spirit, but increases your spell power by 100% of the spirit increase.
My heals provide you with 1-3% damage reduction and 2-6% increased healing from me (Grace, stacks up to 3 times).
I can power infuse someone (or myself!) for better DPS (or healing!) every 3 minutes. This is basically an extra trinket.
Now, I realize this post makes almost no real sense nor does it have a true goal other than for me to bubble about my disc priest... But keep some things in mind. 1: I'm running on 2days with only 3 hours of sleep and 2: It's 12:30am and I'm finally sleepy, so I'm going to crash.
Have a great evening, Azeroth.