I've never had an off and I guess I should consider myself lucky for that. I have no idea how I will react when the situation presents itself, but I always tell myself that I should remember not to try to break my fall/stop with my hands. When I was young I rode with a jeans and a t-shirt, then I had a gap where I wasn't riding for about 10 years and I recently got back to biking, this time I spent an insane amount of time find the right gear and I don't get on the bike unless I'm properly kitted.
Personally I think that avoiding the situation is the best, that said, you can never be 100% sure what the fool in the cage is going to do next. As soon as I get my UK bike licence I'll be looking into getting some advanced rider training, even if it helps to avoid a single off it'll be worth the time, money and effort.