I'm genuinely not convinced it actually saves time once a full accounting has been made. You get the initial result faster, but then you inflict a super slow and torturous review process on yourself or a teammate. Even if the review manages to bring it up to parity, over time you will keep slowing down as more and more code was never written by the humans directing the agents, so their understanding decays.
I at least give the new interns a stern warning: it is easy to speed yourself up by slowing others down if you pump a lot of slop.
My team experimented with re-writing from scratch the prototype of complex functionality made by a non-engineering vibe-coder from another team. We didn't look at the code, and barely looked at the result.
It took about 4 days to get a production-ready reviewed code, while it took them 2-3 months to deliver something that another team judged "impossible to review".
The PR for the prototype was closed.
It helps that I'm a domain expert here, as I have a minor degree in the domain, so I can judge better. But the discrepancy is just too high to ignore.