That is an incorrect presumption - I think it's plausible this is more work; it's certainly far more taxing.
I'm at a point in my career where a small minority of my time is coding. The AIs can do in a day what would have taken me a week uninterrupted with acceptable (in some cases inferior prior to human feedback--but in some cases superior!) quality.
As I do not have 10 let alone 40 hours per week to devote to coding I think it increases the amount of high quality work product I can create with a given time investment. As I review it I merge small independent units and decompose the work.
All that is to say I don't really like it - but I suspect for most *well defined* coding tasks human produced code from highly experienced engineers will largely cease to exist in the next year -- getting cheap/relatively horrible models to produce good code is now straightforward.
OTOH I never use AI for any human facing communication outside of making my writing shorter. IMO AI slop "documents" are almost certainly a drag on organizational productivity.