I don’t have experience with taping horses either. However, I have used KT for my rotator cuff problems. I went 6 months after I first injured my shoulder with constant pain. With rest and then using KT while I slowly regained function, I feel like it really made a difference.
Now, any time I’ve lifted something heavy or reached my arm wrong (like reaching to grab something from my back seat), I use the KT for a few days to “re-stabilize” and rest it.
I’ll admit, though, that after 3 years, I still can’t sleep on that shoulder without discomfort.