To be honest, the time I spent developing on my Transformer Prime, I found the touch screen to be much more efficient to use than the mouse pad.
The touchscreen is useful because it's right next to your fingers, and you don't have to think about a pointers to click on something, you just unconsciously reach for it.
If you get your hands on a device with a good touchscreen and a mouse, try it. You'll find yourself going back to a regular laptop and reaching for the screen.