Imagining writing it down would keep me from actively building mental representations in most situations :)
The writing is semi-automatic and does not merely involve verbatim quotes from others. If today I were to attend a lecture or talk and something the speaker said prompted some visual insight I would immediately draw it as part of my note-taking process. The whole reason I began taking such copious notes, in fact, was the realization that if I didn't write these things down I often needed to have an insight two to three times for it to become a permanent part of my mental model of a problem space, rather than the once.
