I've had many coworkers over the years who made their greatest contributions to the company by doing nothing. In programming, the amount of damage some people can do by actually doing stuff is almost inconceivable.

Edit: I had one programmer colleague whose code fired a 125 mph knuckleball a foot above a ten-year-old kid's head. I had to physically intervene to prevent a fistfight between my boss and the client, certainly the only time that even happened to me.