Hell yes... and if I was to find that I was not ready.... last second thought about something in the carry on or whatever... I would try to move aside and get out of the way... if necessary verbally (or non-verbally) encouraging people to go past...

Only been in that situation once.... but geez.. if you aren't ready to go it's a bit much to object to folks passing!

This shouldn't be limited to airport security lines either!