The Claude Code use case that has saved me the most time so far is just "get this slightly out of date ML repo working on my workstation".
I just clone the repo, tell Claude I want it slightly modernized with a simple script to do smoke tests, etc. It figures out the dependencies, fixes the inevitable CUDA issues, etc.
It legitimately saves me dozens of hours of debugging a month and projects that I would otherwise just not even attempt become immediately viable.