Think of the Tesla Autopilot as enhanced cruise control
Cruise control is helpful because it allows me to drive distances without subconsciously accelerating or decelerating at intervals - consequently, the car travels a bit faster and, more importantly, we save on gas. I assume the autopilot would allow economical driving on a scale to make a significant difference in a month's commuting expenses. And when using cruise control, we of course must keep hands on the steering wheel and pay attention to the road. The autopilot could also help one slow enough for school zones and other places where tickets might be issued for failure to slow down.