re: Why do people rush to be first to board a plane?

I like to board early to be able to lock in my son's car seat and have everything placed strategically. I know to grab a seat belt extender right away and my son sits on my seat while I strap his in. The plane has never waited on us. I also wait to be the last off with him, so his short legs don't hold people up. I usually book 1-1.5 connections to take my time.