Sometimes those things are way more complex, for example when it's about matching over a string rather than an enum to convert it into an enum. Typing out a regex would take me maybe 10mins or more, and with the LLM I can just describe roughly what I want (since it knows the language, I don't have to explain it in detail, just something like "make this into a switch statement" is sufficient usually).
10mins at a time really adds up over a full work day.