1. Search engine - Words like "teach" or "learn" used to be slapped on Google once upon a time. One real great thing about LLMs here is that they do save time. The internet these days is unbelievably crappy and choppy. It often takes more time to click through the first item in the Google result and read it than to simply ask an LLM and wait for its slowish answer.
2. Pattern matching and analysis - LLMs are probably the most advanced technology for recognizing well-known facts and patterns from text, but they do make quite some errors especially with numbers. I believe that a properly fine-tuned small LLMs would easily beat gigantic models for this purpose.
3. Interleaving knowledge - this is the biggest punch that LLMs have, and also the main source of all the over-hype (which does still exist). It can produce something valuable by synthesizing multiple facts, like writing complex answers and programs. But this is where hallucination happens most frequently, so it's critical that you review the output carefully.