How about separating into 2 lines (at the point where we reach the screening machines); 1 line for the "ready" and the other for, well, the others? Really strictly enforced!

Seriously, though, I also try to be organized about this and not hold people up. A person with whom I frequently travel seems completely clueless; every trip through security is like the very first time. I've learned to go ahead so that I can collect the belongings of both of us while he's still ambling through the procedure. But I feel really bad about the folks behind us.