One interesting technique to reduce the review burden in Home Assistant, a project with a large community: ask PR authors to review other PRs!
Screenshot is from
Porting my 2016 Rust project from getopts to clap, and it's amazing how far the ecosystem has come.
clap gives me a nicer help, automatic value validation, and can even generate completions for shells!
First screenshot is getopts, second is clap.
The TypeScript docs have IDE-like hover types on all the examples, which is really impressive.
I also like how the second example always shows the type of the relevant part, regardless of mouse position. It's clear and mobile friendly.
Screenshot from
https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types