Hm, maybe the word "visualize" is distracting, from what I meant. When I programm, I also do not visualize it, in the meaning, that I have a graphical picture in my head. (At least not all the time )

I mean the mental graph and flow of the program in my head. And being a visual person, I can translate it to somehing graphical, but it does not neccesarily mean it is graphical. But thinking about it, gave some me interesting insights. ("insights" again, a word from a visual dominated world)