I couldn't agree more, Taz. Not only facing some uncomfortable things in my first time taking the 12 steps, but in continued progress as well.
It's gotten to be almost a joke with me. Whenever I have to muster up a little courage or when I'm dragging my feet on something, inevitably it ends up leading to growth if I stay willing to carry out the action. Even if it doesn't feel like it going in.
We can talk about the comfort zone being reinforcing to the ego, or any number of reasons why, but the bottom line for me is that growth seems to come through doing what is right, not what I want to do.