For me, personally, I'm building things that would have been impractical for me to do as cleanly within the same amount of time - prototypes in languages that I don't have the muscle memory for, using algorithms i have a surface level understanding of but would need time to deeply understand and implement by hand, and, at my pace, as a retired dev, is probably quantified in terms of years worth of time and effort saved.

edit: also, would I take the time to implement LCARS by hand? No. But with an LLM, sure, took it about 3 minutes or less to implement a pretty decent LCARS interface for me.