This is my observation as well. I thought I was good at testing (I wanted to be good at testing), but the models are just better at it. Testing in particular rewards a tireless cataloging of the tiny and the tedious and in this respect LLMs are unmatched.

Single data point, my Sentry notifications across more than a half dozen client projects when from 2-4 a month to basically 0. That's while shipping 20x _more_ code.