Another variation where George's setup has benefit is putting a small instant hotwater heater on the same circuit as a garbage disposal.
One outfit markets an air switch for the control of the disposal that does exactly the same thing that George's 3-way does.
But I have to wonder about the dishwasher purely from the manufacturer's perspective. Solid state controls are appearing on more and more dishwashers. A power interruption will re-initialize the control chips. The older mechanical clock would just pick up where it lost power.
