Caveat: I know next to nothing about horses, but I did have a recent golden-horse interaction.
I took Abby to a good friend's farm a couple weekends ago - first time around horses. We started slow, on-leash, from a distance...Abby was thoroughly puzzled. She'd walk up about ten feet towards them then turn and look at me, then look at the horses, then look at me, etc etc. General sentiment was: "What the *BLEEP* is THAT???" followed by a few seconds later by "Can it be my friend? It must be my friend!"
One of the horses, Sampson, is a pretty laid back friendly horse (has a few anxiety issues but he internalizes them). The other, Josh, is a rescue from the thoroughbred race tracks and is very high strung. They're both about 20 and didn't grow up with dogs around, although my friend got a dog about four years ago (medium-sized mix, about 40 pounds, named Chloe). Chloe's pretty chill around the horses and mostly simply stays out of their way when she's in the barn or the paddock with my friend. The horses have a very large paddock with a barn, so they are also able to get away if they want to.
As for our visit: Sampson was very curious about Abby, although we never let them actually interact. Josh made himself scarce most of the time we were visiting. Overall, I think it was a good experience for everyone in that nobody was pushed out of their comfort zone.