I have recently been using chatgpt to estimate calories from pictures or descriptions. The few times I've checked, it's pretty accurate and is OK about providing ranges where it's uncertain.
I also ask it to tally calories for a day. It's got a chart of calories accumulated for me. It's so much easier than any app.
I often use copilot to avoid looking up syntax for things I should remember. I'll just comment / ask what I'm trying to do and it'll tab-complete that line. I rarely use it for boilerplate or larger amounts of code. But that one use saves me tons of time and context switches and is totally worth it.
I use ChatGPT for rough fermi-style questions. "How much does a cell phone weigh" etc. So much quicker than google, and better.
I often use ChatGPT to have an interactive learning session about surface details of a field I'm interested in. It allows me to find hooks into wikipedia or other search engines for specific topics to read more about, and to get questions answered quickly. It is second to none for this type of interaction and is really incredible.
Midjourney has taken hours of my life the last day or two. I love generating images in the style of this or that. For example, I'm creating schematics / blueprints for flying warships from the game highfleet, and printing them because they look cool. It adds some nerdy flair to my office. When I worked for NASA, my colleagues would do that for rover parts they've worked on, so I like the idea of capturing video game stuff as though it were important. If midjourney had a "buy print" button on it, it'd be dangerous and lucrative.
I feel like there's a couple startup ideas in this post.