Amazing how we assume there is a need to board the plane faster. It likely doesn't matter how quickly you can board the plane, since the process of loading luggage, fuel, and preparing the airplane for flight will still take as long as it does and often takes longer. Have you ever sat in your seat and watched the baggage handlers load luggage?

Deplaning is another matter, of course, and generally I think that is actually quite efficient. People who hold up the lines are usually embarrassed and therefore police themselves. Every once in a while a fool holds up the line, but mostly each person adds no more time than the space ahead of them can allow.

Proof? Ok, how often do you find yourself in a secondary lineup, bag in hand, near the door of the aircraft? Nobody in your way now but the lineup ahead to get out of the corridor.