I've been using it for the same purpose, especially on technical topics where I simply don't have the breadth to even know the specific terms I need to google. Google used to be decent at this a decade back, but recently unless you provide the exact terms and surround them with quotes all you'll get is generic nonsense. So now instead GPT has taken on the role of being a cranky wiseman who will sometimes give good pointers, but will sometimes troll you. But even if you don't take everything it says at face value, it will usually be able to spit out the domain-specific terms that you can then independently lookup in the literature yourself.

Oh and another perfect use-case is for writing. It's basically the ideal thesaurus. You can ask it directly words that mean X with a nuance of Y, or for idioms that mean X, or so on.