I also think in this way; I typically describe it to technically inclined people as being kind of like thinking with a command line interface instead of a GUI,

I also think in this way; I typically describe it to technically inclined people as being kind of like thinking with a command line interface instead of a GUI, although the metaphor is rather imperfect. More strangely (to most people with whom I have spoken), I often dream entirely without images--occasionally even as written prose. Edit: Perhaps interestingly, this does not seem to harm my ability to do spatial inference, but I have essentially no long term image recall.