Lol 8TB is just one of my enclosures. I will be putting 8TB in my desktop when it comes too.
I do a lot of hobbyist game development (programming and graphics), photography, 3D modeling (Maya and ZBrush), digital painting, digital music, etc. Basically everything that takes up a ton of space. Photography and 3D modeling take up most of the space. I also convert all of my DVDs to mp4 files because they always go missing, or get scratched, etc. I also keep two backups (one offsite) of all my stuff so I have around 26TB total of drive space I use.
I also am a student (online) and some of my project files for class reach into the astronomical proportions as far as size goes since I like my stuff to look nice and refuse to skimp on special effects for the sake of file size.