I'm finding it to be just the opposite - futzing around in the codebase is more effective than ever, it just looks different.

My futzing around is now at a higher level and involves enlisting the help of agents to dig through the code and logs and other sources to help solves problems.

Right now I am working an effort to reduce the amount of "build friction" across our code base. Even scoping this out would have taken a non-trivial amount of time and fixing it would never have been funded. With the help of AI tools, I can now attach this problem and make the lives of hundreds of engineers better.