Connecticut  - Some writers think in paragraphs, if not in whole chapters.

Jim Harrison, a congressional speech writer I knew long ago, was one of those people. He would envision a speech in his mind, turn on his IBM Model C electric typewriter, and literally bang it out, flying across the keyboard using only his index fingers. It was a mesmerizing sight to watch as page after page of newsprint sheets of paper rolled out of the machine and piled up. And then, when he stopped typing, he was done. I can't remember him making any corrections on the hard copy, though he certainly must have done that at some point. Not only was this process amazing to witness, it also was profoundly intimidating--and infuriating as well.

Because there are those of us who start with the first word on a blank sheet of paper and patiently wait for our fingers to connect with the words in our subconscious and unscramble them sufficiently to form the upcoming sentences. Speaking from personal experience, writers who lean in this direction tend to edit early and often, making the process of finalizing the first several sentences a time-consuming experience. But even past the opening thoughts, when the words usually become more fluid, editing what's been written is an ongoing process because each new thought requires rereading at least some portion of the preceding paragraphs so the additions merge in effortlessly.

So more accurately speaking I'm a rewriter rather than a writer even when I've thought up the original words in the first place.

Thoughts on Writing
The computer certainly has been a boon to writers who start editing as soon as two words appear on paper. No longer are we faced with the frustration, unattractiveness, and sheer confusion of cross-outs, strikeovers, and wadded-up pieces of paper littering the floor.

Now my words in print look as though I've momentarily channeled Harrison.