I once rode a horse who never looked where his feet were, just went on as fast as you'd let him.
Mmmmm. This would be Oily. He came to me from a Dressage background; 4th level I have been told, and _not_ by his former owner, either, she just said she did Dressage with him. I don't think he had ever been ridden outside of an arena, or at least not very much / not on anything technical. I learned very quickly that you have to pay attention to the trail surface, because he isn't, _and_ that you really have to watch out for obstacles, as he would rather jump over them than sort out a way to walk thru. I have seen him fall on his butt _In the Pasture_, while showing off for other horses.
I say he is an "Arena Horse", and I have talked with other riders with similar observations about their animals. This is a really good argument in favor of cross-training your show horse on trails, BTW. Oily has gotten somewhat better over the years, but he still loves to run and jump, and he is a showoff; he will spontaneously do "trail-dressage" if he thinks he has an audience :-) I've had friends say "Oh; that was so pretty; how did you get him to do that?" "Oh, we're just good!" Yeah, right.
In the general experience of everyone out there, is there a correlation between people micromanaging their horses and attempting to micromanage the humans around them?
Sue, I have issues with Modern Psychology generalizing human behaviors, and then attempting to apply the generalization to specific instances. This very much applies to Equine personalities as well, and doubtless it is appropriate in some, maybe even most instances, but it tends to become a . . . Well; a self-fulfilling prophecy if you will.
But it _is_ kinda fun to do. So, yea; I have observed the tendency to micromanage horses carries over, and also anger and fearfulness. What is the psyhco-babble term; "A Control Freak"? https://en.wikipedia.org/wiki/Control_freak
My personal philosophy is that "Less is More", and I try to adhere to this policy by offering the minimum input necessary to get the desired response. Maybe that is psycho-babble for "Lazy", whaddaya think?