Indeed, it's odd, but I think it's related to my imagination regarding visualisation being rather poor; I don't tend to 'form pictures of what's happening in my head' as many seem to report, and, as such, my ability to retain the information is lacking. I appreciate how it may be written, but few books have really resonated with me (I do love Shakespeare's plays admittedly, but I generally watch them first and then breeze through the scripts afterwards before watching them again). For writing, in contrast, I like the problem solving aspect (how to phrase sentences, composition, remove characters from situations, connecting events, creating thematic parallels, etc.) so the need to actually try and visualise it doesn't come into play. It definitely is quite uncommon though I will agree.