Edit: even more funny is the "Magic" Trackpad. Watching people mouse around on big desktop monitors at the speed of molasses with one of those always cracks me up. The only "magic" in it is that it makes any mouse-intensive work take twice as long to complete.
I've looked at the gestures documented by Apple on their site and I didn't see anything that couldn't possibly be done better with a mouse and a mouse wheel (and decent software).
Not having easy access to gestures slows me way down while working.
If I want to play a game in Bootcamp, I just use a standard two button mouse.
Track pads also allow gestures which greatly speed up app navigation and multitasking.
Most importantly, all my wrist problems went away when I got a trackpad because it's a more relaxed position for my hand, it requires little effort to use, and it works the extension muscles of my fingers.
After a few weeks of using it, the trackpad and its gestures have become second nature and have made me more productive by effectively disappearing into the background. It doesn't feel like there's an interface between me and the cursor anymore. Of course, YMMV.