I'd consider myself a very experienced (~30 years), but mediocre dev, and this AI thing has completely transformed my capabilities as a software developer. People compare AI to a "smart junior" or something like it. To me, it's more the mentor I never had. When I have AI review code that I wrote, I will point out things I would either have never thought of, or would have taken me weeks or months of going back and forth to figure out. There are lots of things in software development that I hate doing, such as CSS/HTML, AI is now filling the gap that used to be an obstacle for me. With AI this now has become fun as it feels like I am not alone working on this thing. What it produces, I can understand and I review its work as well as vica-verca. I mostly use it in assistant mode. I do not have an army of agents running (yet).

I don't know how people steer multiple agent sessions in parallel. The constant cognitive switching is exhausting and you miss moments unless you are cli jumping. It is like being an operator.