I can also visualize real things to a degree, but it's kind of like when you see something in the corner of your eye, the brain has some visual info that makes it to your experience, but it isn't super legible. I can visualize pretty much whatever to that extent. But it is the other stuff, what you were describing, that made me totally sure I couldn't possibly have aphantasia. That's the visualizing I'm actually really good at.
Edit: Also, what is the difference between mentally seeing something and having the feeling of having mentally seen it? How are these not the same thing?