Everyday for about 6-7 months. And I still do from time to time if my knee is acting up. There are days every now and again where I can barely press the pedal with my knee not giving out.
As for the tractors, usually only drive with both feet during planting/tilling seasons. You're actually working both hands and both feet all at the same time. One on the clutch, one of the brake, one on the wheel and one on the hand throttle. Doing so is why you don't see tractors cutting giant ruts in the fresh plowed soil. Don't do it that way and the front tires will dig as they turn and cut a rut 2-3 feet deep