You asked whether it's really better than "what we already had with search engines, online documentation and online Q&A sites".
How have you found it not to be significantly better for those purposes?
The "not good enough for you to trust" is a strange claim. No matter what source of info you use, outside of official documentation, you have to assess its quality and correctness. LLM output is no different.
If you try it yourself you'll soon find out that the answer is a very obvious yes.
You don't need a paid plan to benefit from that kind of assistance, either.