"I can't say I find a switch an essential feature, but it's handy sometimes. It's usually a lot easier to flip a switch down the back of the sofa (say) than to unplug."
Which leads to...just why ARE standard wall power sockets so close to the floor? They always seem to be the about the same low height, where ever you go. Is there some sort of regulation? If so, what's the reasoning behind it? Clearly they can be placed higher, eg kitchens along the work bench, or near dressing tables and similar in hotels.