There may be something completely obvious I'm missing, in which case please enlighten me!
Yesterday I was flying home with an airline that assigns seats to everybody on check-in. Nevertheless, as soon as a member of staff appeared at the boarding desk, 70% of those at the gate sprung up and dashed to form a queue. Of course, they weren't ready to board for another 15 minutes (and hadn't even made an announcement yet) so everybody just had to stand around for 15 minutes. I stayed sitting because I couldn't really see what the advantage of queueing was.
Is there one? 