Is it really that hard to just, you know, delete a few files whenever you download something? Download X. Okay. Download Y, go to open Y, delete X while you're there.
Somehow I have 6 TB of data and it's all organized. I don't have any files on my Desktop or Downloads folder. Amazingly, I don't have to spend 4 minutes looking for something when I need to pull something up to look at it or send to a friend.