There are two types of people when it comes to computer file management: the ones who have a million versions of the same file in their downloads folder, and the ones who are meticulous and know where everything is stored on their computer.
I am the latter. You'll never see my desktop cluttered with a bunch of unnecessary files, nor am I in the dark about where anything is located on my hard drive. It's why I always have a guest login for whoever uses my computer -- there's no way I'm going to let anyone mess with my settings and ruin my work experience for me with their lack of clutter-free empathy.
So seeing these messy computer desktops is an extremely traumatizing experience for me.