What are the common usecases of the visitor pattern?

I was looking for the common usecases for the Visitor pattern. I could found some examples in the internet, but they are rather basic and only explains the concept, not when this pattern may really save your time.

Do you have a real world example using such pattern ? (i.e in an existing java project in Github for example)

I don't see clearly what problem does it solve in a large scale and why a developer may use it ?