For much the same reason, we put in a momentary contact switch on the wall.

It's close enough that you can reach it while standing at the sink, but far enough that there's little to no chance of bumping it on accident and it would be awkward to reach the switch with one hand while your other hand is in the sink.

To make it easier to distinguish, it's also a different color than the rest of the switches in the kitchen (grey instead of white).