Sometimes you have a bunch of windows open. And you want to launch something. But you didn’t check the box to create a start menu entry when you installed it. But you did check the box to create an icon on the desktop.
When that happens, you press Windows+D to minimize everything, so that you can see your desktop. Then, you can launch it.
Then comes the part that take some serious skill. You gotta press Windows+D again to restore all your windows. And you gotta do it really fast, before new program starts. Because once it starts, pressing Windows+D will just minimize that new program. And you’re stuck restoring all your windows one by one. Like a sucker.