Photographic memory? Yes- I do it too.. When I'm stumped, I'll go, "I remember I wrote this in that corner of the paper, in that size."
It apparently didn't help me in cytology. Remembering various squamous, simple-squamous, cells, erythrocytes was a total nightmare!
Edit- I also like taking notes on copy paper. It allows for more versatility in how I 'group' my notes.