My favorite use of Stream Deck (XL) is hooking it up to a small, custom API to quickly change my Slack status at work. It’s so nice to smash a single button and walk away to lunch or walk my dog.
Stream Deck lets you run a GET request from the default button set. The code part is pretty uninteresting, really: express handler wrapped around the Slack Web API. Throw in some query vars so I can set the emoji, text, and set the minutes after which it will clear (or 0 for never clear).
I also have the top row filled with world clocks.