Unless you travel First Class with one of the better airlines (when you personal assistant picks you up in the lounge and drives you to the aircraft), boarding is a real pain for passengers.
Hurry up and wait, one step forward one step back, it’s like this ridicule dance we all dance in the alley. Turns out airlines could save up to 7 minutes boarding passengers and make the whole process a lot smoother. Watch this little video from VOX and be enlightened.