usually, when I have hit my stride in work-related writing -- I am unconscious of my thought processes or of my composition of what I am writing. During other, less lucky, times, I struggle a bit with slower thought and composition, and I am conscious of the words I am using.

Sparteye, if I didn't know better I'd think we were twins separated at birth!
When I am composing a story and I am in the zone the whole forms and my typing can hardly keep up with the story ... other times it's uphill through a downrushing tide of thick molasses!