The extra time in the queue is nothing to do with security. It is all to do with the appearance of security. They have to be "seen to be doing something" after failing the checks.
I say this beacuse a Captian I was flying with was refused access airside recently. He was in uniform, and had his ID. When this failed to swipe, he showed his passport and licence - not good enough for the security guard, he had to show a crew manifest. Lucky we had one. Now where on earth does it say we need a crew manifest to get airside? The fact his pass didn't swipe was not the Captain's fault - it was one of the new issue ID's that BAA haven't got working yet.
This whole process took about 10 minutes, while others waited patiently behind. I then went through and the didn't even swipe my pass!!!!!