If you really in good faith want to understand where people are coming from when they talk about huge productivity gains, then I would recommend installing Claude Code (specifically that tool) and asking it to build some kind of small project from scratch. (The one I tried was a small app to poll a public flight API for planes near my house and plot the positions, along with other metadata. I didn't give it the api schema at all. It was still able to make it work.) This will show you, at least, what these tools are capable of -- and not just on toy apps, but also at small startups doing a lot of greenfield work very quickly.

Most of us aren't doing that kind of work, we work on large mature codebases. AI is much less effective there because it doesn't have all the context we have about the codebase and product. Sometimes it's useful, sometimes not. But to start making that tradeoff I do think it's worth first setting aside skepticism and seeing it at its best, and giving yourself that "wow" moment.