No.  The computer has "pedal assist" which turns on the motor when it senses any movement in the pedals...I'm actually exerting no energy at all pulling any of those deer out.  When I  stop pedaling, the motor stops supplying power until I start pedaling again.

If you don't feel like moving your feet at all, the bikes also have a "throttle" where you can just give it juice and take off...I have a twist grip on the right handlebar grip so its just like an electric motorcycle.