One of the somewhat offensive ideas that runs through all this is that Americans are somehow less inclined to "queue" and wait their turn than Brits. T'ain't true.

Americans are fairly fastidious about getting, and staying, "in line", even now. It is not uncommon to see people line up, even when there is nothing to actually line up for. Maybe we have a different style, but we do it, and we we take it very seriously when people cut in.