> So, essentially, my experience is that it's automated away the easy bits

Yes, which is great for “easy” but mundane and time consuming tasks like refactoring structs when you have a ton of tests that look at snapshots of nested structs etc. Squeezing that last few bits of “make comments consistent with the style and tone of existing comments”, or “stop adding docs that make it sound like an academic paper” or just keep the overall feel of the code same across all files take a lot of effort and energy.