I've used it for very, very specific cases. I'm on Kagi, so it's a built in feature (that isn't intrusive), and it typically generates great answers. That is, unless I'm getting into something obscure. I've used it less than five times, all in all.

Then how will I know how many ‘r’ is in Strawberry /s

Generative AI is a tool, sometimes is useful, sometimes it's not useful. If you want a recipe for pancakes you'll get there a lot quicker using ChatGPT than using Google. It's also worth noting that you can ask tools like ChatGPT for it's references.