Yeah, loads. The key is really, really detailed prompts and not blindly taking what it says as truth. I've used it for:
Job applications (matching up my CV/experience to the job description, making my personal statement more concise, preparing for potential interview questions, etc)
Career planning (asking it what skills I can/should develop, where the 'growth' areas are in my field, how to move my career from one area to another, etc)
Coding (it's great for this, but you need to know what you're asking it to do) so I save time by not having to look stuff up/ check the documentation for a particular coding library
Copy editing (tightening my prose, getting something within a word count, etc)
Interpreting the results of quantitative analysis, to make sure I'm not missing anything obvious
Menu planning (put in ingredients I have available and my nutritional preferences, or 'how can I use up Xg of Y')
Fitness programming (I put in my desired goal and my current paces, etc, and it comes up with an x-week plan of e.g. 3 sessions a week)
And so on...