This is what all guests should do. If you need to leave the queue, you should return to the spot you were at when you left the queue, not way ahead to meet your families.
We have done this, my DH who gets really upset at line cutters, not children having to go for a potty break, or even adults needing to go (we have experiance with this, and his father has issues and often has to go now, older adults can have issues as well), but line cutter's, he states flat out that if we all can't get into the line at the same time, we wait until everyone is ready.
Well, when we went during our wedding in 2011 there was 18 of us. It worked out really well, the waiting till everyone was ready until this one time at POTC.
I had thought DH & his best friend were right behind us, and lo and behold they are not. I look back and there is about 20 ppl between them and us. So I called to everyone up the line, and we all stood and waited right at the spot when you enter into the building to let them catch up, meaning that the 20 ppl between them and us went first. Looks of shock ensued from those being sent past us, but it was the right thing to do. They where two, they could have easily pushed past everyone to catch up to us, we waiting where 10, but we stopped and waited for them.
I am not telling this story to make us sound all wonderfull or anything, I, like everyone else wants to get on the rides asap lol, however It would have been pretty darn hyocrictial of me to complain about line cutters and then turn around and not follow up on what I preach.
It can be done with a large group, waiting until everyone is ready, we did it for a week with at times the full 18 of us. It takes planning and the willingness to wait, not rush onto rides.