One of my parents and one of my sibs visualize words for spelling as well. Actually, both of them can visualize books. Ask what happened (or even for a quote) at some point in a familiar or recently-read book , and if they can't name it off the top of their heads, they mentally "look" at the page and re-read it. Which is why they both dislike new editions of old classics!

And yes, both of them have good visual spatial skills.

...pronounced like the long vowel and first letter of the alphabet...