I'm still working on my 'goals' document for the upcoming year as I had some other things to first on in the first month and i've used it to rephrase and rewrite a lot of it and also to help calculate and break it down into chunks.
I used it as a calculator, to calculate savings, how much i needed to save a month and what my total in the account would be at the time, then i just copied and pasted that into a spread sheet.
I've asked it to summarise articles that I like, so i can get the gist of it and understand the core concepts.
I even asked it for some ideas on games to play to get my friend to guess a trip i booked as a birthday present and it came up with some good ideas.
I just keep finding more and more different ways to use it and although it's not perfect, it helps with generating ideas and going through my thoughts, calculating things and helping me express stuff.