Aside from funny pictures, I rough out concepts for personal projects while commuting or on off time, mostly. It's pretty decent at rough calculations now, but even if you don't trust that, if you have a project in mind and you describe what you want to do, it can tell you what formulas and background knowledge you will need to flesh it out and you have the names that you can look up for further details. Really cuts down on research time and it's better time spent than scrolling memes.

Had an idea to add tracking to my alt-az telescope, asked Meta AI what I need to understand and it explains right ascension and declination and even provides the coordinate transformations needed (and even in a language that I specify). I can audit the code and have it write some unit tests that I also check, flesh it out a bit and I'm done.

That kind of thing.