Outside of games, you could use it in your desktop or laptop as a drive for different things. On my Mac, I use a 512GB for torrents instead of having it write to the SSD. I also have one that the Photos.app saves the Local iCloud Photo Library to.
Likewise, if any of your media apps let you set a default location, you can take advantage of it and have the apps and programs save content there, I do this for DVDs and Blu-Rays I get to have a digital copy.
Yep! Sometimes they are dreams from when I was a toddler.
I don’t understand why they randomly happen, but I am amazed that something I remember from 3 or 4 years I can still remember.