As a counterpoint to many of the answers already posted, I find Apple's multitouch trackpads essential to my use of a computer. I've never particularly liked using mice, but I could never tell why until I used a trackpad for the first time on my iBook G4. Since then (and especially with the increase in gesture support over the years), I've gone all-trackpad all the time.
I find trackpads to be, in general and in my usage, to be much more precise than mice: I find delicate operations in Photoshop much easier to perform and I find hitting small buttons in interfaces to be much easier. (This is probably because I have better fine motor control in my fingers than in my wrist and arm. I generally operate a mouse using the muscles in my upper arm such that my elbow moves along with the mouse.)
I use the multitouch gestures all the time, particularly two-finger scroll and right click, three-finger-drag, the various four-finger swipes, and the five-finger pinches. I don't use tap-to-click or back/forward gestures because I frequently accidentally trigger them.