Up front, I will cop to having no context for this debate, since I've never ridden TSM standby and so haven't seen the line, but...
reading the OP, my immediate reaction was "of course it was ok to pass the picture-takers." And frankly, it's very surprising to me that people consider doing so to be "line-cutting." Until I read the rest of this thread, it wouldn't even have occurred to me that the OP did anything wrong. IMO, the photographer was clearly wrong -- once the line started moving again, she either needed to pack up her camera or let everyone else move forward.
Correct me if I'm wrong, but I assume it's analogous to the new HM queue -- when we were there, we enjoyed the new interactive stuff while we were in front of it. As soon as the line started moving again, we moved on, too. When DD wanted to stay and play with the books for another minute, we stepped aside and the line kept moving without us. When she was done playing, we rejoined the line with no problem. All around us, people were doing the same thing, and nobody threw a hissy (neither the stoppers nor the passers).
Now, I wouldn't pass someone for a few seconds' delay. But from the OP, it sounds like we're talking more than a minute or two, and that it wasn't a matter of the line creeping up a few feet in the meantime. In that circumstance, passing seems like the only logical solution.