Comment by wahern

Few people routinely mentally visualize with the same breadth and vividness as dreaming, unless perhaps they have poor dream recall or don't dream very vividly. It's probably more rare than aphantasia.

On the flip side, this means with some introspection most people can appreciate how those with aphantasia think; most people use a mix of mentalisms for cognition, it's just not as apparent as visualization. And unless it's happening subconsciously, I'd venture to say visualization is the exception, it just stands out because it's more common when you're deliberately thinking in a self-aware manner.