I've been in Zermatt (for hiking, not snowboarding), a couple of years ago. And we walked over the Zermatt gletsjer which is also a piste. I must say I was not very impressed. The steepness is very lousy, overall it doesn`t have small bumps orso to jump over. I didn't saw the other pistes, but if I looked to the plan the total area doesn't look big at all.
Zermatt is also expensive, it is a bit a rich-family-city. Mostly hotels, cars are not allowed in the city, so you have these golfcars (as mentioned above).
If you really want to go to switserland check out 'Portes du Soleil' it is on the border with France.
I strongly suggest 3 vallees in France, simply because it is a very big and snowsure area, and not that expensive (if you dont go to Val Thorens).
Check also the other post about snowboarding in Europe/France.