This has basically been my experience since Sonnet 3.5. I've been working on a personal project on and off with various models and things since then and the biggest difference between then and now is that it will do larger chunks of work than it did before, but the quality of the code is not particularly better, I still have to do a lot of cleanup and it still goes off the rails pretty frequently. I have to do fewer individual prompts, but the time spent reviewing the code takes longer because I also have to mentally process and fix larger chunks of code too

Is it a better user experience now? Yes. Has it boosted my productivity on this project? Absolutely.

But it still needs a ton of hand holding for anything complicated and I still deal with tons of "OK, this bug is fixed now!" followed by manually confirming a bug still exists.