Mike,
I'm glad you wrote this post, and I'm glad you are resposible and considerate when you are on the water. I've fished those Arkansas rivers with heavy traffic, and have personally witnessed some of the most disrespectful, disgusting river etiquette I've ever encountered. About 3 months ago, on a stretch of the Little Red River, I actually had a guide (with a client) blast his jet boat downstream, across the line of a fish that was being fought. It was in 2 1/2 feet of water in a trophy section of narrow river called Mossy Shoals. This guy was a total jerk. He even had oars on the boat, and made no attempt to slow down or even to quiet the engine. This was one of Crystal's 1st trout on the line, and all I can say is: I'm glad he didn't stop when I was exploding my obsenities....I would have surely gone to jail if I got my hands on him.....it still gets my adrenaline going when I think about it...I never knew I could become so angry.
Crowded fishing, in general, can create stress and competition. That's why I get away from it, and like you, I always walk the boat behind people casting when possible, and appologize if it can't be done. You should ALWAYS idle or shut off the motor when approaching other anglers, and try to keep a good distance...And for God's sake, get out and walk the boat up of you're banging into rocks and gravel when going upstream.
I guess I've been spoiled, because we just don't have the boat traffic on the Holston and Watauga rivers in low water (yet.....

). I do know of more than one occaison where fisherman have pulled guns on disrespectful boaters to let them know they were getting too close

.
The rivers are always going to draw in crowds, and as we each seek our own solitude, and escapes into wild, wet places; we're going to have to learn to respect others' space, and do what it takes to explore more to fully enjoy good flyfishing.
1) Walk downstream a little further
2)Try new spots on the river, you've never fished before
3) Accept the compromises if you fished crowded shoals
In the past four years, I've fished 1/10 the time as I did during my teens and early twenties: and I've caught more fish over 24" than all previous years combined.
This is all because I've chose to explore new water(escaping crowds), that I previously neglected out of laziness.
Travis