I recently used Google's Gemini to review and debug some code that was performing some runtime code generation in .NET. It pointed out some issues I was aware of, some cases I hadn't considered but would have eventually hit with some testing, and then helped debug why some tests were failing. Pretty impressive actually. Probably wasn't a 10x savings, but definitely 2x or more in some cases, and some of the tasks it eliminated were the tedious ones, which is a big help for motivation.