The climb up there is steep, but not so much that anyone of normal walking fitness can't make it. The path is well maintained and has good steps. Also, it offers some interesting views of the horse; from the path, you wouldn't guess that the whiteish area (it is not as white as it appears from afar) has the shape of a horse.
How the horse was made and what happened with it during WWII is described here on wikipedia.
Once you're up, you have a combination of great views and wide open spaces. It is said to be one of the finest views in England.
While I agree that the views from there really are great, I feel there are other views around Yorkshire much dearer to my heart. For instance, there aren't the dry stone walls and typical barns dotted across the hills which I so like and associate with Yorkshire. Still, I was duly impressed and took more pictures than you'll ever want to see.
To get back down to the car park, we chose a different path than the one we had climbed on the way up. It was such a contrast: From the windswept open spaces into a green tunnel of branches and leaves. That woodland was certainly enchanted and enchanting!
It was a walk I won't forget, but the day was not yet over.
Our next stop was Helmsley, where I'd been only once before, more than 10 years ago with Steve.