Structure and planning vs The Flow

I know that, for me at least, a key to long-term success is planning. I carefully track my tasks. Each day I make a list of what I want to accomplish, and plan the day hour-by-hour. I know this is important. At the same time, I'm most productive when I get in "the flow"—that state of intense focus where one loses track of space and time, and is absorbed in the activity at hand. When in the flow, I don't want any interruptions—not moving to the next task, not having dinner, nothing.

I struggle to reconcile the tension between these conflicting ideas.