I like how Disney’s buffets are set up. Most are the walk-up kind, with small bars that you can hop over to, instead of having to wait in line (unlike most Vegas buffets). It’s very similar to buffets on cruise ships.
So, since they are set up that way, I grab a plate, get what I want, and go. If there’s plates on both sides of the bar, then there isn’t really a line to follow.
But, you’ve also got to watch the crowds. If it’s really crowded and people seem to be going in a line, then I wouldn’t go against the flow and try to break in. But if there’s one person in front of you and a huge gap, then I’d say it’s fine to skip the person.