Maybe I miss understood your question too.....
I never have photographers 'touching me' because I'm rarely competing for the exact same shot, but if I'm lined up for a shot (e.g. ring going on the finger, or knife about to cut the cake) then I wouldn't move, why would I? Would you? Maybe if we have a clear shot from a couple of other (better) angles then I'm willing to compromise, but if this is the only angle and I got there first then that's the way it's staying.
It's not a lecture, it's a wedding. There are entrances of bride mates, parents, the ceremony, the crowd, so many things to film. One can't just stand in one place if you want the video to be interesting and live.
Of course we move around during the day to catch all the action, but we
never move during the ceremony (we'd get thrown out of church if we tried it!) or speeches - that's why we have multiple cameras (generally between 4 and 6) and edit between them for the best angle at that moment in time. Shooting with a single camera and moving around just causes parts of the ceremony to be missed and/or creates shaky footage that needs to be edited out. Other than maybe the 'news', you don't get shaky footage on TV shows or at the movies, so why should you accept it on your wedding video?
I guess if you are shoulder mounted you can't do much about the shaky footage except keep moving to make it look as if it is intended (Steadycam is better for this) or try to stabilise in post. I've lost count of the videos I've seen on the web that were just shaky enough to annoy yet could so easily have been stabilised using After Effects or Motion. I don't understand why people don't do it.
For church weddings we ALWAYS attend the rehearsal and Ok the camera positions (manned and unmanned) with the officiant. We also turn up at the church at least 60-90 mins before the ceremony to setup and do audio checks. The same goes for civil weddings at venues, turn up early, get setup and stand your ground.
Compare that to the photographers that almost NEVER attend the rehearsal and then turn up 5 mins before the ceremony complaining we got all the good places to stand. Go figure.....
Did I misunderstand your questions?