Yes, I have used it as a respect training tool with Dragon, to keep pace and distance. It also lets me know in a hurry what frame of mind he is in, and whether we will work nicely that day, or end up having a battle.
When I go get my horse from the field for my lessons I trot her up the tractor path to the barn. I let her go loose if she is not spunky that day. Sometimes she likes goes way ahead to I walk her in circles. It is good practice for showmanship.
I take my 23 year old mare for walks regularly. She has had a 7 year break from riding and was not in the best condition when I got her, so I am working very slowly with her. Lots and lots of walking. It is great that she is traffic safe since there aren't many trails around that allow horses which I don't have to trailer to. I can basically walk her anywhere. Both her and I get bored easily, so I try to take a differant way every time.
I do this with my gelding. We mostly hack and often I will get off and walk/jog the last mile before home. He used to toss his head and get pretty excited, but now he is great at keeping pace and staying out of my space.
I don't. I'm too lazy and my way of thinking is like this "Why in the world would I do something that I absolutely hate (running) when I've got access to a horse with 4 good legs that can carry me?" LOL.
This seems like such a great way to build up endurance (for both of us) and trust, while establishing further ground manners and boundaries. I'm going to keep this in mind for when I bring my horse home.