Let me be clear about this. You will write more code in the Zone. If you are practicing TDD, you will go around the red/green/refactor loop more quickly. And you will feel a mild euphoria or a sense of conquest. The problem is that you lose some of the big picture while you are in the Zone, so you will likely make decisions that you will later have to go back and reverse. Code written in the Zone may come out faster, but you'll be going back to visit it more.