I took the test and apparently I fall into the lowest five percent for richness of mental imagery. I recall being frustrated by exhortations to "close [my] eyes and imagine" things as a child, as if I was being asked to do something evidently impossible. And I always assumed that the counting sheep thing was mostly about the counting and that nobody could actually see sheep when they did it. Do people really see shee…
Also, when I see movies derived from books I know whether they depict the same setting I took from the book. I know if the characteristics mesh, but don't really recall "seeing" the settings while reading.
Tend to ace those spatial tests. I slaughtered all my friends in Descent -- I almost immediately had each entire spatial 3D map in my head and knew where to go to get anywhere regardless of ship vs map orientation.
So yes, I recognize your experience almost exactly.