What one does, when waiting in line, can determine whether there are too many people or not.
One time as I was at the US border crossing and the line was long. I thought, "oh no, a long boring wait," but then someone, in line, saw my bicycle helmet and ask where I'd ridden from. We got into a very nice conversation. It wasn't cars, but pedestrians waiting inside the customs building.
Pretty soon, almost too soon, the wait was over and the conversation ended as we went our separate ways.