You know how when you stand in line at the bank, or grocery store or some other type of line standing place, the moment the first person in line moves, there is that two step shuffle everyone else in line does to fill the space?
The bank teller will say "Next". The first person in line walks to the counter and then the other 20 people, standing between the stanchion ropes in line, all shuffle up just to wait for the next teller.
I don't do that.
I know the people behind me get all miffed. I can feel their stares on the back of my head and I can hear their mumbles and I can read their thoughts of "Why isn't this guy moving? There is a whole two feet in front of him. Oh my god! Fill the space dude. You are going to make me late."
It's not like I am letting people cut into line. I am merely expanding on my own personal space in front of me. I also look at it as an opportunity to make the people behind feel better about their wait. If I let the 5 people in front of me go to the teller and I don't fill their space in line right away, when I actually do move up in line I am moving 10 feet or so at one time, instead of 2 feet 5 times over. And when I do this, the people that are behind me all get to move 10 feet as well, and then they think to themselves, "Wow this line is moving pretty fast."
So I think of it as a public service.