As an aside I once went on a tour of the museums of Amsterdam with an expert guide (paid for by the company I was visiting). It was fantastic! A completely different experience from being a regular tourist. I learned far more about Amsterdam and the art than I could possibly have done on my own.
This is true with basically every place and a proper guide.
I understand why people don't usually hire a person to walk then around when they're traveling solo or with their family, but if you're a mildly curious person it's a fantastic way to experience museums, archeology and nature.
When I first started traveling I avoided guides, and didn’t want to be a “tourist”. Over the years I’ve gotten over that and started going on more tours, I learn so much more than I otherwise would, and get access to places that are normally off limits. It’s a much better experience.