Another use I haven’t seen mentioned is that it’s good when you only have a single monitor. You can easily use shortcut keys to flip between the desktops. I could have my remote connection to another computer in one desktop and my local stuff in another and easily switch between the two.
I imagine he’s like Ghost Rider and can tell with a glance if someone is guilty or not by seeing their soul. If the entity has a soul, then he knows. Goldfish? Probably not. Sapient reindeer? Definitely.