When you type the code, you definitely think about it, deepening your mental model of the problem, stopping and going back and changing things.

Reading is massively passive, and in fact much more mentally tiring if whole reading is in detective mode 'now where the f*ck are some hidden issues now'. Sure, if your codebase is 90% massive boilerplate then I can see quickly generated code saves a lot of time, but such scenarios were normally easy to tackle before LLMs came. Or at least those I've encountered in past few decades.

Do you like debugging by just tracing the code with your eyes, or actually working on it with data and test code? I've never seen effective use of such regardless of seniority. But I've seen in past months wild claims about magic of LLMs that were mostly un-reproduceable by others, and when folks were asked for details they went silent.