Summarising articles / extracting information / transforming it according to my needs. Everyone knows LLM-bssed summaries are great, but not many folks utilise them to their full extent. For instance, yesterday, Sony published a blog piece on how a bunch of games were discounted on the PlayStation store. This was like a really long list that I couldn't be bothered reading, so I asked ChatGPT to display just the genres that I'm interested in, and sort them according to popularity. Another example is parsing changelogs for software releases, sometimes some of them are really long (and not sorted properly - maybe just a dump of commit messages), so I'd ask it to summarise the changes, maybe only show me new feature additions, or any breaking changes etc.
Translations. I find ChatGPT excellent at translating Asian languages - expecially all the esoteric terms used in badly-translated Chinese webcomics. I feed in the pinyin word and provide context, and ChatGPT tells me what it means in that context, and also provides alternate translations. This is a 100 times better than just using Google Translate or whatever dumb dictionary-based translator, because context is everything in Asian languages.