Jerry Pournelle says he has never known anyone other than Isaac Asimov who enjoyed writing. He knows plenty of people who enjoy having written, but not the process of writing.
I guess I would say that there are times when I enjoy the writing itself, but most of the time the writing is something I must do in order to have the satisfaction of having written.
On arriving home from my trip to San Diego, I found a check from Analog for my story “Resonance,” which was accepted a few months ago. Getting paid for having written just makes it that much better.