I think it's still an open question if it's actually a net savings of time.
The absence of evidence is evidence in its own way. I don’t understand how there haven’t been more studies on this yet. The one from last year that showed AI made people think they were faster but were actually slower gets cited a lot, and I know that was a small study with older tools, but it’s amazing that that hasn’t been repeated. Or maybe it has and we don’t know because the results got buried.
One thing I’ve noticed is that effort may be saved but not as much time. The agent can certainly type faster than me but I have to sit there and watch it work and then check its work when done. There’s certainly some time savings but not what you think.