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>>dillon+(OP)
Pretty sure I have aphantasia. So, I don't visualize anything. But, I do often imagine data structures and algorithms as ambiguous "things" at places and in motion. Can't see them. But, I can move them around and remember where they are. Like, imagining Bubble Sort as a shell game with your eyes closed.

>>corysa+g83
I'm in the same boat. No visual imagery but I do "see" abstract relationships and how they interact. I'm reminded of a case where a man had head trauma-induced blindness. He couldn't see colors, shapes, etc. But it turned out he could still see motion. He described it as black moving on top of black. It's sort of like that, somehow I experience the contours of the abstract relationships, but they feel very insubstantial.

>>hackin+6b3
You can experience this easily yourself: https://en.m.wikipedia.org/wiki/Motion_aftereffect

Motion is separated from shapes and structure and objects changing place very early in visual processing, and it's kind of a sense of its own.