yeah, i bet it has every presentation ever done sitting in good ol' ~/Documents or the desktop.
But I struggle to follow a consistent structure, so it could be in Documents or Notes, or a random folder somewhere else because I ignored my hierarchy in a hurry.
Honestly, now if I need to make sure I keep something, I upload it to Google Drive. It sucks for privacy, but their search is good enough that I rarely need to use the hierarchy. The hierarchy is now mostly to group things I want to perform actions on together.
Anything of importance, I have broad directories under Documents, and then sub folders. Or sometimes I'll put them on my fileserver with similar directory structure. The Documents folder is backed up with Spideroak.
And if not, then they should hire me and I'll set it up for them. :D