Having Your Cake But Eating the Frosting
Whether a hobbyist or a pro, a writer has personal demands that seldom pause for breath.
Case in point: If the writer is one whose mind is constantly churning out ideas for new projects, the writer cannot stop herself from putting those ideas down on paper or on the computer.
Flip side: If the writer comes up against the wall of blocked ideas, she cannot stop thinking about the fact that she's blocked and without any new ideas to work on.
See what I mean? Constant demand for attention from the mind. Why?
Writer's live in their heads. (Okay, some take breaks from active work, occasionally, to deal with life's little exigencies that crop up from time to time. Pets or extended families will distract just as frequently as spouse and kids.) But, I'd be willing to put a few bucks on the fact that the writer's mind is still on that idea that she's attached to at the moment.
As writers we tend to take bits and pieces of real life to color and fill-in the stories we're currently working on. Doing the dishes is an uninterrupted space of time to allow the mind to reorganize one's approach to a new story, develop a character's backstory, or to evaluate a setting's appropriateness, etc. It's work time not used at the computer.
Watching the kids on the playground or in the park, all while taking your own kids for a day out, works just as easily as daydreaming time in the bathtub, but with moving "potential" characters and scenes all around you. Soon everything you encounter in daily life becomes part of the writing life, until you can't separate yourself from it.
All of this mental activity is why writer's live inside their heads. They no longer can envision life without writing. They no longer breath without thinking about one project or another. They no long care whether people hear them talking to themselves in grocery stores.
Okay, so maybe that last one takes a bit longer to accomplish. Then again, writers have been thought of as eccentric for centuries. Why not perpetuate the perception?