I have a level 80 priest, druid, and warrior, as well as a level 42 paladin and 38 shaman. The priest is my main, and although I go through phases and have considered promoting one of the alts to “main character” status, I always find myself going back to my priest.
But why?
The druid class it the most versatile in the game. It is the only class that can heal, tank, ranged dps and melee dps; not to mention the fact that it can do all of those roles very well. A druid is known for being an effective PvPer. Druids have unique and powerful buffs that make it useful to ’stack’ druids despite Blizzard’s efforts to “bring the player not the class.” A raid can never have too many innervates and battle resurrections. And let’s be honest, Epic Flight Form is damn cool.
The warrior can tank and dps. My warrior has maxed out mining and engineering, which means that I have a steady flow of income and bank access/ghetto mage portals at my disposal. My warrior’s gear is much better than my priest, and he kills even-level mobs in about 5 seconds.
I see potential in my lower-level characters.
Paladins have always been a strong class. They can tank, heal, or dps. Their blessings are highly regarded and they provide further utility in the name of Replenishment. They are arguably the best tank healer, and can change specs and tank it themselves with a simple spec/gear change.
Shamans are great raid healers and can deal either melee or ranged damage. They have a self-res, essentially another hearth stone, and provide the most utility to a raid thanks to the flexibility of their totems.
So with those attractive options, why do I feel bound and loyal to my dwarven, blue-quality priest? After all, it takes him three to four times as long to kill a mob than my druid or warrior. He’s maxed out tailoring and inscription, neither of which are “fun” or profitable professions. Shadow spec isn’t fun to me, and most of the benefits that it provides to a party can be supplied by other classes.
Maybe it’s that I’m most familiar with him. Maybe it’s that I can switch specs and heal for any situation. Maybe it’s his his strapping good looks. I don’t know. But what I do know is that the day after Cataclysm drops, you’ll find him smite-ing his way to level 85 while my alts collect dust (and rested XP) in Dalaran.
So tell me, why do you play your priest?

{ 1 comment… read it below or add one }
Why do I enjoy my priest? I like the variety of healing spells she brings to the table. In PvP she’s very very hard to kill. I respecced Disc for that and well the amount of survivability is amazing. At times I feel ‘godlike’ in PvP. It takes a lot to take Holi down.
I have a lowbie Druid too, and she’s fun. She’s currently level 52. I picked up Restoration at level 40 and have been having a blast with that in PvP. I imagine when she hits 80 I’ll have two mains. My Holy Priest and My Druid. My main focus is PvP.
I disagree with you on tailoring and Inscription those can be extremely lucrative professions depending on what you sell, of course. Leg kits sell well and I know the demand for them will be even higher once the next patch comes out. Inscription is another profitable profession but you’ve got to study and see what sells. A website that shows the popular glyphs is a good option to see what glyphs are hot.