Most people who suffer from this could be shown a 3d modeling or CAD tool. I would explain it as having access to this when you close your eyes, except its hazy and comes in and out of focus.

It can also be used to conjure a short movie like sequence or animation as well. I most frequently use it to plan routes in my mind whether its in the car or how I'm going to move through a particular space it helps orient you and improves reaction speed and can be tied to muscle memory. It takes some focus and is rarely used simultaneously with other activities. It's more like a planning or focusing activity for brief bursts before you take action.

Its actually quite like those slow motion 360 sequences in the matrix. I think that's probably why that film technique gained such traction, as its a slowed down version of what our brains do when we use our visual memory to navigate our movement.

That's a good description, and seems to align with what I think I feel - a sensation, I tried to think of examples that weren't images for me, but just a sensation, but I think, at least in my 30 second brainstorm, I always got an image, but it was always a very simplified one, and the more complex the idea, the shorter the sensation. This was not done scientifically at all, but what I'm trying to say is thanks: that's a pretty succinct description that I can get behind.