Of course, when a poem is being born, the reasoning part of the brain throbs away at full throttle, but all the other areas are overlapping and interacting as well, the emotional, intuitive, animal areas.
For me, writing never gets easier. It's always hard work. It doesn't matter how many words you wrote the day before, or how many novels you've completed in the last decade: every day you start fresh again with that same blank page, or that same blank screen.