Recently used Cursor/Claude sonnet to port ~30k lines of EOL Livescript/Hyperscript to Typescript/JSX in less than 2 weeks. That would have took at least several months otherwise. Definitively a force multiplier, for this kind of repetitional work.
Shame that you can't probably open-source this, that would have been a hugely impressive case study.
And yeah, out of all the LLMs, it seems that Claude is the best when it comes to programming.