"usually somewhere that knows how to put enough people on the staff to deal with the number of customers you have at that time"
You must live in a truly magical place indeed. Not to put too fine a point on burger joints (although I've never seen an idle clerk in any of those either) but as a more real-life example, I don't think I've ever been in any supermarket that was staffing more than _at most half_ the actual number of checkout tills that were needed at that specific moment for a vaguely civilized experience (out of the myriad more tills they had sitting empty and sad)...