I usually find that the queues to park at supermarkets are caused by people looking to park as close to the entrance as possible. I'm sure that if some of them had their way, they would drive up and down the aisles.
......and as for those who create chaos for others by parking on double yellow lines outside the local newsagent instead of parking just off the main road, simply to save themselves a few seconds and a 40yd walk, don't get me started.