Bolloré Bluecar. Electric, so the lever goes forward to go forward, stays in the middle for not going at all and goes back for going astern. Simple
Daf 55 Variomatic. Forward to go forward, back to go back, switch on the dash for more revs.
Bigger Daf. Turn knob to choose direction, select tortoises for low speed manoeuvring. Twelve gears but they look after themselves.
Citroen Cactus. Couldn't be simpler, just push button of your choice.
Mack Twin Stick. Use one hand for one lever, use a second hand through the wheel for the other one (and break your arm if you hit a large bump), use third hand to steer.