This is what makes NaNoWriMo great for me. It gets me out of my head and putting words to paper. I’m a big “discovery writer” so I constantly get to know my characters and the plot while I’m writing — which is great but also has trapped me on more than one occasion in an editing loop. I write a bit, come up with a new idea, and rework the start of the book to match that idea. Before I know it I’ve rewritten the first three or four chapters a million and ten times.
NaNoWriMo curbs that by helping me consider my first drafts more like outlines they really are. Absurdly long outlines, sure, but outlines nonetheless. I’ll admit I’m burned out at the end of every November, but it ends up being totally worth it. After a month or two away from writing anything long form, I’m normally ready to start editing.