Technically, the lockers aren't in the queue. They are just outside of the planned queue entrance. It's just that, at least for now, the queue extends past that point.
We've been a few times and we've always gotten split up at the lockers. I grab the bags and go through the locker while my wife (and other family when they are there, too) continued around the outside where TMs told them to keep moving.
When I walk out of the locker building, I can't find them because they are way ahead in the queue. I either 'excuse me, pardon me' my way past 20 - 30 groups or I hope my wife just stops in the queue and waits for me.
So non-locker people don't lose their place in line, but the designated locker person does.
I can't blame the TMs for keeping the line moving, but it does create some confusion and the potential for people to get mad at others that appear to be jumping the line.