I understand what you're saying, I really do, but if one doesn't WANT the dang cookie, why should one "have to learn" to eat just one?
I am three years out and maintaining beautifully. Sweets don't affect me for the most part with the exception of Hershey Kisses. If I open a bag, I'm finishing them, so I don't.
My life is more pleasurable avoiding certain things all together, no moderation desired. Could I learn? Probably. Do I want to do that to myself over a non-essential, unhealthy food option that I've had ten lifetimes worth of? Not really.
If you want to learn, more power to you. I'm far too old and cranky to find "pleasure" in what could derail a major success I'm experiencing.