I think it's the opposite. When I'm on the edges of Real Difficult Stuff (TM), then LLMs are less of help compared to when I just need basic web applications or similar "beginner stuff". If what you're working on doesn't exists in the training data at all, the LLMs can sometimes be more in the way than helpful, as they don't seem to even "grasp" the problems correctly.
I still get tons of productivity boosts from LLMs, don't get me wrong, and I wouldn't stop working with them even though they aren't perfect for everything, they do with a lot of monotonous tasks, like all the stuff you outlined. But the moments I'm working without LLMs, that's the time I'm working very much on "not beginner stuff".