The seats are assigned. People have been standing in line for 15 minutes now. Why on earth would anyone want to stand there, when they could just sit and wait until the line clears?
I understand wanting to get off a plane ASAP, but boarding? You just end up sitting on the plane, waiting for everyone else to get on.
I was flying 4-5 times a year when I worked remotely for a tech company. First few times was neat. I got over it fast. A bunch of cities/airports really suck and treat you like cattle.