I just saw this conversation so probably a lot of this has nothing to do with the recent posts (I've only read the first 2-3 pages of posts. Sorry if my comments are not relevant lol.
As far as visualization goes, I can, like DB said, very clearly visualize something like a dino biting onto a building, ripping it off the ground, and going to town on something, tearing an entire city to shreds. I can imagine the gestures of the dino, the snarling and the growling and how it would shake its head fiercely as it demolishes whatever lies in its path. What has always been weird to me is that I can never translate these images into drawings. Perhaps it is my lack of knowledge of anatomy, or of how to draw things in general, mainly because I don't draw nearly as much as I should. But even simpler things that are beyond basic shapes, like a frog jumping off of a rock; I can imagine the elegant spring-y motion of the frog's legs as they extend and how the frog flies in a parabolic curve, eventually rotating midair slightly to land again. But if I try to animate something like this from memory, absolutely impossible.
I've gotten better at conveying poses and actions from my imagination lately, thanks to doodling for hours throughout school. But it's strange how clearly I can imagine a motion in my head without being able to draw it the same way.