Some people have surrounded themselves by yes-men instead of LLMs, and it seems to me that it comes to the same thing.

Partially yes, but I think there's a substantial difference: LLMs are like always-on Yes Men that also roleplay as very competent engineers. So if your assistant Joe Sycophant always tells you how great you are, you might become inured to it; deep down you know Joe is just a shmuck. Also, Joe needs to sleep and you might drive him into burning out.

LLMs, however, roleplay as alway available, very capable, very detail-oriented engineers who also happen to be sycophants. And, unlike Joe above, they have no self-preservation and their jobs are not on the line if they royally fuck up. Much more dangerous, in my opinion.