Yes, it's a huge change. For me, it has already happened, and I like it. Since the end of September, agents have made about 960 commits to a project of mine, and I haven't written or read a line of its code.
About 6 months ago, I mostly stopped reading the code. And since a few weeks, I also stopped testing the changes manually. Before, it felt like I was the agents' QA department. Now, each agent shows me its change running in the app, in a short narrated screen recording. A fix takes me 30 seconds to watch. When something is off, I say what, and the agent goes another round.