For me the usefulness of LLMs is proportional to how shitty google has become. When searching for something you get a bunch of blog spam or other SSO optimised shit results to pages that open dozens of popups asking you to subscribe or make an account. ChatGPT gives you the answer immediately and I must say I find it helpful 90% of the time.
For simple coding questions it is also very good because it takes your current context into account. It is basically a smarter "copy paste from stack overflow".
At least for now LLMs do not replace any meaningful work for me, but they replace google more and more.