First time encountering the term 'debugbar', I see:

> This project is inspired by what you get in the PHP world, with the Laravel debugbar for instance.

Curious to know what a debugbar does? From a read of the docs (and a play around) it looks like it lets you navigate your site as usual, but it displays which controller/action got you to the page, any callbacks, and database queries. Anything else? What's a typical use case for this, or is it more like turn it on and it's just handy to have that extra info in your dev environment?