While I love Angular, I feel the author is wrong on a few things. It doesn't provide a way to structure your codebase, that's still up to you… directives.js isn't going to scale at all. That's also one of the things I love about angular. The code is modularised, but that isn't enforced on the filesystem. You can choose to lump things into files in a folder for directives, or you can put all your routes, directives, filters etc for each feature in a feature folder. You have plenty of control.

Also, I feel like their example is better served as a filter, rather than a directive.