Who does? Tons of people - hard to tell if your experience is really that compartmentalized, or if you're trolling.Honestly, who uses a mouse anymore?
We've all gotten so used to trackpads by now, and they're much more expressive and accurate anyway.
I personally prefer the Magic Trackpad, but each form factor (trackpad, mouse) excels at a different kind of movement/input. One is not inherently better than the other, the way you paint it.