Disclaimer: This is by no means a rip on shamans, I still love them, but I've found a new love as well.
Most people know about the discipline priest and how great of a healer they are. I personally love having one in my group, and love playing with them. I'll admit I dont know all that much about them but what i do know really impresses me. I was recently in Naxx 25, assigned to tank healing by my guild master because he trusts me (I had the most SP!). I really didnt have much to do, the other main healer we had was a disc priest from the guild. I was stareing at my combat log after fights, just looking at all the number that got absorbed. I love my shaman, but I am now in love with the discipline priest.
3 months ago