This was a great SL talk: https://www.reddit.com/r/ProgrammingLanguages/comments/d4k7fm/parser_parser_combinators_for_program/

Berger's talk on Performance Matters was amazing. Garth has already linked it. I also liked "Building Haskell Programs with Fused Effects".

I think there is more stuff that can be built with paranthesis parsers. I'm thinking of monoidal parsing / incremental parsing for editor tooling. I could think of a paranthesis and indentation parser as a first stage of parsing, with a traditional parsing filling in the gaps between paranthesis. Using something like this: