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it's funny, now i'm trying to think where it is i find a wheel better, i can't think of any specific examples :-)
I'm doing a bit of photoshop/aftereffects stuff at the moment (making parallax motion clips out of stills) and just panning around in both applications is much more accurate if i use a wheel instead of my magic mouse, which tends to land me right over the other side of the canvas rather than a little to the left, for instance. I'm probably just clumsy, though.
It's more settings and stuff where the indexed wheel lets me increase/decrease (or whatever) incrementally, rather than the touch sensitive mac mouse which is kind of like trying to keep a cat in a bath.