Well, for me horse riding isn't about doing the half pass, or getting him on the bit, or jumping 4ft showjumps. It is about the freedom of being able to point him at a distant speck and just letting him run. It is that sense that you and the horse share a conciousness and that he will move and do whatever you ask, before you even ask him to. It can't be quantified by how many competitons you win or how high you can jump.
I once had to "herd" a frisky colt across the mountain. He was tiny, leaping about and trying to get away. I had no ropes and no way of leading the animal. Just me and my horse. And I didn't have to urge him on, rein him back or move him left or right, he just did it. I barely had to think and he was already cutting the colt off and pushing him back on track. It was an experience like no other, having your horse leaping and spinning beneith you and understanding your every subconcious request. I have had to catch loose horses at shows or on X-country courses so many times, not to mention actualy doing the courses themselves and the ability to get that complete trust and co-operation outweighs any number of schooling lessons.