Second this. I'm aphantasic, but when I think about 3d space, it's like there's an invisible grid in my mind that helps me keep track of relative positions, and my sense of direction is possibly even a bit above average. Conversely, I'm often surprised by common it seems to be for strongly visually minded people to have a terrible sense of direction.

I have enjoyed exploring and comparing my inner experience with other people since I discovered I was aphantasic (my ex was an artist and very visual, and first I thought she was the odd one). Now I usually do a little informal psychometric test session with people when the subject comes up. Asking them to imagine standing outside the house where they grew up, then walking to the kitchen and pouring a glass of milk. I have them rate their inner experience on a hand-to-hand scale for: color, sharpness, detail, focus area size, opacity/transparency. It's interesting how much people vary

My inner experience as aphantasic is:

Visuals:
- Closing my eyes I generally see black. Sometimes I can see vague, morphing images, blurry and colorless, if I'm falling asleep into a dream. On high doses of marijuana or normal-to-high doses of LSD I get some stronger visuals, but it still seems a far cry from many others sober-state visual imagination

Sound:
- This was my next surprise after discovering I had visual aphantasia. That other people apparently hear themselves talking in their head. I have an inner monologue (and dialogues), but there is no real sound quality to it. Same thing if I imagine a song or a melody. I know how it goes, I can sing along in my head. I'm a songwriter, so I also make up melodies all the time, but I don't 'hear' anything in my head. This is a more confusing concept to convey than the abstract spatial awareness.

Taste / Smell:
- Again, apparently it's common to be able to imagine eating this or that food, and actually smelling and tasting it. I lack this ability too. I can get an idea of whether something will taste good with something else, but there's no sensation of taste

Dreams:
- My dreams are actually very vivid, and after experimenting with lucid dreaming before, my dream recall is generally good too (though dream recall works like other memories, so it's all abstracted into spatial positions, dialogues and knowledge about location and details)

Also agree with some other things that some people have written here:

- I've always found it hard to pursuse long-term goals or imagined futures. I tend to gravitate to what I find most interesting at the moment and follow that impulse

- I find it fairly easy to get over bad experiences

- I don't 'miss' people much, even if I really like it when I spend time with someone close. I imagine getting over a breakup would be a lot harder if you kept having vivid memories of times you spent with them. My memories are a lot more abstract and vague.

- Photos are a memory aid. Should take more of them
- I'm bad at recognizing faces, especially if it's someone I don't know well and they've changed their hairstyle, or they look similar to someone else. I easily mix up characters in films/series, or fail to notice that some character is played by [famous actor I know] until the credits roll

- I generally enjoy reading non-fiction much more than fiction. Though I have read a lot of fiction books in my life. Knowing what my experience of reading fiction is, and comparing that with what it can be for people who are not aphantasic, I do feel a bit envious

Since I discovered aphantasia, I've at times felt like I'm lacking something, and missing out on part of the human experience. However, after talking to people at the other end of the scale, I actually appreciate that I can close my eyes and all I see is black, and that silence is actually silence. If you have no control over the images and sounds that appear in your mind, I feel that it could be both exhausting and anxiety-inducing depending on the content and intensity