Why the other line[s] is likely to move faster and psychology.

Bill Hammack explains in simple terms how your line (queue) is likely to be slower compare to others [video] with mentioning Erlang's work. An interesting point in his explanation is that how humans perseive multi-queue over single queue with multiple-servers, namely assumption of multi-queue is necessarily better. Similar misconception appears in the airline boarding rules. It is very interesting that we think that multiple queues would help in row-based boarding on the airline, which is not. Recent work by Israeli group shows that random boarding is superior [doi].