Text, images, videos up to and including the occasional rare film, lots of PDFs (usually small), sometimes a PowerPoint or an Excel spreadsheet, used to also do source code and builds and stuff before GitHub... and if I had faith in them being more useful, as opposed to just backed up, I'd probably dump a whole bunch more in my semi-organized DropBox folder.
So for my use-case the Organizer App would have to be able to deal with lots and lots of data of various types, occasionally including multi-gig files like the rough cut of a film, and also know when I "mv this ~/Organizer/that/" -- a tall order, I know. But with storage so cheap these days, I still dream of that.
Re: semi-organized DropBox folder: this came up here recently and might be of help to organize your files: https://johnnydecimal.com
The app I'm working is more focused on capturing knowledge as structured notes. It sounds like a good full text search could already be of help in your case. That maybe combined with slowly categorizing your content with a system like Johhny.Decimal or something similar.
So for my use-case the Organizer App would have to be able to deal with lots and lots of data of various types, occasionally including multi-gig files like the rough cut of a film, and also know when I "mv this ~/Organizer/that/" -- a tall order, I know. But with storage so cheap these days, I still dream of that.