6,000%! We need folders and sub-folders in our library to be able to create a hierarchy of objects. I’m not sure if categories would help, because sooner or later, some content creator would drop something in the wrong bucket. If we can arrange our items in to our own folders, though, we can categorize everything just the way we need it!
I note that you’ve moved all of the Quixel stuff in to its own folder, so that’s a start. Unfortunately, the enormous pile of random Quixel items is only part of the problem. For example, I’d rather have ONE folder with all my rocks/stones in it.. not just the QuIxel stones.
At any rate, you’ve implemented folders by creating the Quixel folder, so it should be butt simple to give us a quick link to create our own folders and sub-folders. 
Git 'er done, Epic!