When I spell out a word, I don't visualize anything. Using words in conversation, typing, or writing is also innate - they flow through without touching my consciousness. This is another aspect of my maxim, "my subconscious is way smarter than I am." It responds quickly and accurately, at any rate.

I consider myself to be adept at the English language, and more objective evidence bears that out. I scored 36/36 on the English portion of the ACT, managed to accumulate enough extra credit through correcting my professor in my college level writing class that I didn't need to take the final, and many people have told me that I write very well in many different contexts (collaborative fiction, business reports, online forums, etc.).

I would go so far as to say that if I make an effort to improve on my communication by the use of conscious thought, I do worse than when I "feel it out."