Honestly, it works because it works. For me, I learned about myself. I learned where I stopped and someone else started. I learned what I could and could not control in my world. Working the steps taught me about setting and maintaining healthy personal boundaries. I learned about where I came from and why I did some of the things I did and believed some of the things I believed.
And maybe there's a little bit of magic in there too. Who am I to say otherwise?