Not really, no, but most of the people on here are going to say yes. Unfortunately for them, about all they're going to get out of it is aggravation when people do this while they are in line. For the most part, it isn't going to affect the people "line cutting", as there are almost always places throughout the line where they can go around those that try to prevent them (I know there are going to be those that come on here and talk about how they would block them from going around, but in reality that is only going to work for a few minutes, eventually there will be a place where they can just duck under the rope/chain and go around you anyway).
Funny thing, though, is that many people on here will also say that their family will have to wait for them at the loading dock. Of course, that generally ends up causing delays for everyone in line because the family in question is now in the damned way. IMO, it's just better to let them join their family and not let it bother you.