(1) I am very fast at writing rough notes down in a microsoft word doc.
(2) I am also very fast at turning these notes into grammatical and inelegant sentences.
(3) I am very fast at turning these sentences into slightly better sentences.
(4)I am fast at revising these sentences so that they are actually good.
Nevertheless, I cannot perform all these steps at once. I cannot produce elegant sentences directly out of the messiness of my brain.
It might make you feel better to know that my mind is just about as messy as yours. My initial thoughts are no better arranged, no more specific, than anyone else's. What I think I am better at is the 1st step and the last: I am better than most people I know at simply generating the ideas in the first place, and also at the final stage of writing it in a decent style. I doubt I am better at (2) and (3) than the average person.