Another reason why I hate Disney busses - It is a free for all at the Deluxe resorts. I don't really care when I get on a bus - if a family of 4 shows up after me but somehow manages to get in front of me once the line actually forms (usually when the bus is pulling in and we can see what park it is going to) It doesn't bother me. If it means I don't get a seat and have to stand - big deal. Of course, if it means I have to wait for the next bus (which I don't believe has ever happened going from resort to park) then I guess it would annoy me. There's no hurry though, we are all going to the same place and will get there at the same time but whatever. As far as who gets to sit and who doesn't, I have come to terms with the fact that no matter what, someone, somewhere will be offended by my actions and you can't please everyone. Sometimes I find it's easier to just stand if the bus (may) be full. Of course, I do think the people standing should be the first OFF the bus, for obvious reasons but sometimes even that can be an issue.
I'll tell you one thing though, I certainly don't watch and keep track of who was there first, second and third - I'm too busy thinking about what I want to do once I get to wherever i'm going to care.