I don't like the default explanations. But I prompt for small code snippets with explanations of a problem and the solution. This is in the context of extending features, fixing bugs, reviewing new code etc. I still skim the code, but it's nice to have a somewhat thoughtful overview of the key points like database schema, API spec, algorithm or abstraction. It makes it easier to skim a large diff without feeling lost. It also quite often catches some weird choices that might slip through it not carefully reasoning about the code. For me it is hard to understand code I didn't write myself so I have landed on this workflow.