Funny. We had a security guard that had memorized all the faces of the employees. If he knew you he'd buzz you through. If he didn't know you you'd have to be vouched for by someone that he did know or by showing your credentials. By day #3 he'd know you, and he also somehow knew when you were no longer with the company.

There never was a line and there were 1400 people in those buildings.

I never realized how incredibly that guy's contribution was but this story made it perfectly clear.

Also, I don't actually buy the story as related here. It would seem to me that within minutes of that queue building up the turnstiles + card system would be disabled because something clearly was not working.