I genuinely think that large language models are a useful technology in data processing. Being "language models" I find it easy to use LLMs to extract subject, object, quantity, time, verb, amount, user's language code and so on from the input text, and to a fairly trustworthy level. After that, standard Information Retrieval techniques take over.

What LLMs are absolutely not useful for, in my opinion, is answering questions or writing code, or summarising things, or being factual in any sense at all.