I would love to know this too. For me it’s involved too much manual copy-pasting of existing code for context, for it to feel like it’s doing much for me.
For cases like that, copilot (with chat for context) might be more of what you’re looking for. Chatgpt specifically, I’ve been using for very light context / general tasks that I modify. I always consider the trade off between how much time I’m saving by having to write the prompt full of context.