Yes, it is useful. I use ChatGPT heavily for:

• Brainstorming meal plans for the week given x, y, and z requirements

• Brainstorming solutions to abstract problems

• Helping me break down complex tasks into smaller, more achievable tasks.

• Helping me brainstorm programming solutions. This is a big one, I'm a junior dev and I sometimes encounter problems that aren't easily google-able. For example, ChatGPT helped me find the python moto library for intercepting and testing the boto AWS calls in my code. It's also been great for debugging hand-coded JSON and generating boilerplate. I've also used it to streamline unit test writing and documentation.

By far it's best utility (imo) is quickly filling in broad strokes knowledge gaps as a kind of interactive textbook. I'm using it to accelerate my Rust learning, and it's great. I have EMT co-workers going to paramedic school that use it to practice their paramedic curriculum. A close second in terms of usefulness is that it's like the world's smartest regex, and it's capable of very quickly parsing large texts or documents and providing useful output.