I see myself as a pretty hardcore player in skill, rather than time spent. I used to be a vivid FPS player before my time in WoW, so most of the time I'm using the mouse to turn (yet I still have Q and E bound to turn left and right, respectively) and I use keybinds for everything that do not require quick reaction (profession skills, etc).
I do not really mind others keyboard turning, I mean it's only a game and everyone plays it the way he/she likes, but I do get a bit nervous when I see full Relentless/Wrathful people on my team keyboardturning mid-fight, because I also believe mouse turn (along with keybindings) are better than keyboard turning + clicking.
But each his/her own style, I guess. Whatever you're comfortable with.