Yes, closing your eyes and being in a dark room has the same effect (to me at least). As I mentioned in another reply I think it's simply because there's no visual input to process so your mind can focus on images better/more efficiently.
After all a decent amount of processing comes from visual input, I figure that's what makes stuff like a Rorschach test or cloudgazing to be a thing, or certain optical illusions. You are parsing what you see and the brain takes some licenses for speed at times.
It's clear everyone is hardwired to see stuff like faces in something as simple as ":)", I feel it's related, but it's not my field, I can only wonder.
Is there any science done on this particular topic? It sure is super interesting but all I see about it is anecdote or very surface level stuff. It's clear some people do it better than others (my anecdata seems to indicate creative types might tap into it better?), but since most people is also affected by certain optical effects or tricks, the ability has to be present in everyone to a degree. Might be a thing that needs to be exploited consciously to make it "vivid".
It could also be a matter of priorities in perception. Like some people remembers lyrics better than songs, or numbers better than images. Maybe we are just taking our vision of the world in the way that's the most comfortable, and for some people it's images/sounds and for others "plaintext" information.
I know I really got a thing for visual information, as I can tell stuff like typos not from reading a word, but from noticing its shape is "off", like I'm remembering a printout of the word instead of the word character-by-character. (note that difference in typesetting does not affect the "shape" to throw me off. Unless it's very weird handwritten text, but that throws everyone off)