Similar scenario for the more popular spots here in Maine. The few minor breeches in etiquette I've encountered are vastly overshadowed by numerous instances of mutual respect and civility as you described, both subtle and profound. Maybe it's because we're all Red Sox fans? 🙂
Just a few weeks ago, a good buddy and I traveled to a pretty well known spot. Surprisingly, no one else was at what most consider the best stretch of water. Another fellow showed up a few minutes later and we were glad he did. We respected distance, had a lot of fun chatting with this guy, and all shared in one another's fun when we caught trout (and there were many that day). It enhanced the experience. It was great fishing with this new friend and if he hadn't have shown up, the day would have missed something.