I've never had a problem with people crowding me when I'm salmon fishing. I suppose swinging a 14 foot two handed rod with 60 feet of line hanging off the end carrying a nice big salmon iron does account for the lack of crowding.

I did have one gent toss his heavily weighted lure, from across the river, so it dropped almost at my feet. When that same large salmon iron whizzed past his head and I laughingly apologized for my lack of accuracy, it never happened again. I suppose he didn't think a fly fisherman with a 14 foot two handed rod could cast that far. Wrong!