I agree that there aren't a ton of convincing examples mentioned that aren't relevant to people who already agree w/the value of lisp-style macros -- but if you're interested I used the example of erlang when responding to a comment above: https://news.ycombinator.com/item?id=28343140

FWIW I do actually agree w/pg about macros; I use them day-to-day for more mundane things than his impressive fully-bottom-up approach to programming. But each time I do use them, I feel like "thank heavens I don't have to reach for some weird external codegen tool to do this".