Cursor is the first AI-integrated IDE I've used beyond AI auto-complete. Having the LLM chat agent embedded in the IDE is saving me a lot of time. I find it particularly helpful for providing a skeleton of code to edit or for diagnosing source of errors. It's also very helpful for explaining pre-existing code in languages or codebases you are less familiar with
Good user experience, genuinely increases productivity. Sometimes gets in the way, but it is not singular in this respect.