> If a language is already low-friction, there won't be much benefit to be gained from an IDE, as even a plain text editor will already get you near to optimal productivity in said language.

I don't think the IDE should do "everything" for you, and you should understand how its building/compiling the software. But with statically typed languages and library definition hints. I think I would be wasting time searching docs if I didn't have the hints and type info. I can't remember everything I work with, it's impossible.