Common kitchen/bathroom countertop devices that use 120V20A
This Blender which is used in the "Will it Blend" commercials requires a dedicated 20amp circuit.  I have a smaller model but it still pulls 10amps!  Now most people don't have these, but there certainly are all sorts of mixers, blenders, bread makers, etc. that might require this type of amperage.

I believe that you are required by NEC (in new builds anyways) to have dedicated 20amp outlets in the kitchen.  I think that it's not so much that a single device will pull 20amps, but two devices plugged into a single outlet might.