The spin attack has helped me a ton on some of the story mode chapters. I usually like to have my machine set on high speeds, so it's not easy for me to turn. With Chapter 7, I used the spin attack to get by that sharp turn after you pass by the lava. Also, on the last chapter I used it to save me from falling down.
I found the spin attack to be one of my favorites to use; it's especially good for sharp turns.