I have seen the "right hand rule" in play in a number of different places and it works well if folks are all on the same page; a case in point would be the lower Kenai in AK where you can almost reach out and touch the next boat during the king run, but when a boat is hooked up everyone gives way. Communication seems to be the key.
My observation on my home waters and other MO lakes are that the number of boaters that understand ANY rules is miniscule, especially on a holiday weekend. Boats will be rented/sold to anyone, AND as annoying as it may be, inexperienced folks have a right to be out there.
Everyone needs to operate with their head on a swivel or somebody gets hurt. Even experienced folks can find themselves in trouble if they are not vigilant, especially when conditions are not ideal. Water craft WILL cut across your bow, run right behind you at full speed, and do the unexpected and we simply need to be ready.
I had a close call one late November when I was(I thought) the only boat on the lake; after running about 4 miles on plane I shut down at the mouth of our cove in preparation to idle in and a jet ski pulled up beside me, and I mean RIGHT beside me, after jumping my transom. Nobody was hurt and to be honest I still don't know where that kid came from....but I learned something. I need eyes in the back of my head.
Be safe!
Mike