You use everything you learn.
I'm synesthetic. Letters and numbers have unique colors, which helps me memorize spellings, phone numbers, and even digits of Pi.
I'd be a travel agent in a different era and lifetime.
Old Vines.
How to fold a paper crane. It's something I do frequently and mindlessly with gum wrappers, small notepaper, etc., and I recently learned my mom does the exact same thing.