I also have an OTTB although I didn't get him till he had been a school horse for a few years. I think what really connected us was that he really needed to be a 1 person horse. He really hated being a school horse so when I bought him he suction cupped himself to me within a week!! I had never had a horse bond so close to me so fast!!! I am not saying he trusted me completely, it still took lots of time with his spookyness because he was very spooky, but I could tell once we moved to a different facility how much he trusted me. My B/O thinks he is the cutest thing because he is just like a puppy the way he follows ya and will lick all over your jacket and hands. (he has never bitten anyone, but me, in the 3 years I have owned him. Lol and the 1 time he did bite me he was really mad!! (long story).
Anyways I think they are 1 of the best breeds they are so loyal I will always have OTTB!!!!