Or maybe we just don't have a good understanding of how to learn it (and/or most people don't try). I can't visualise anything but the briefest of fuzzy flashes, and I'd love to learn, but I have no real idea how and not sure I'd invest enough time into it if I did because most of the time it doesn't affect me, so I'd "love to learn" the same way I'd "love to learn" better French (he says while 2 days overdue with his Anki deck) - it's an aspiration that often falls flat in the face of having to invest time.