I never saw the point of this, or Active Desktop back in the day.
But the last three releases of Fedora and Gnome have had a sort of animated wallpaper. It's actually just an XML file that defines times and image files for each time. And it's used to darken the wallpaper when the sun sets.
I use the default one that ships with Fedora but the XML file is straightforward and it's simple to make your own.
One thing that will make me use more advanced desktop features is definitely alleviating eye strain.
In that vein, using a CLI tool to check up on Gitlab pipelines is another recent development. Switching back and forth between a dark solarized terminal and a bright Gitlab Firefox window was becoming annoying.
(I know there are lots of CSS tricks you can do in FF to force dark styles on websites but I try to keep my setup as vanilla as possible to ease its management.)