The reason for image streaming out loud is exactly for the reason you decribe; it brings up more images. Yes it does provide a verbal connection to the visual. Talk faster. Many have the reverse complaint that they have nothing to describe.

As I said before it depends on what you want. And if you don't describe it out loud don't expect to remember it in detail afterwards. We have the same problem with out dreams and they are passing visual imagary for the most part.