For me, most of the value comes from Claude Code's ability to 1. research codebase and answer questions about it 2. Perform adhoc testing on the code. Actually writing code is icing on the cake. I work on large code base with more than two million lines of code. Claude Code's ability to find relevant code, understand its purpose, history and interfaces is very time saving. It can answer in minutes questions that would take hours of digging through the code base. Ad hoc testing is another thing. E.g. I can just ask it to test an API endpoint. It will find correct data to use in the database, call the endpoint and verify that it returned correct data and e.g. everything was updated in db correctly.