I've been flyfishing now for 3 yrs and from day one tried to learn the etiquette (sp) concerning others around me. I think that ff is somewhat like golf (I've played for over 40 yrs.) in that it is becoming more popular and there are people participating who don't have a clue on the courtesies they need to show to others either out of ignorance or outright rude disregard. One thing in defense of fishing in GSMP vs Yellowstone is that the GSMP is the most visited park in the U.S. and is not nearly as big a park as YNP (I have fished there without any problems).