At this year's Laracon US Adam Wathan gave a talk titled "Cruddy By Design" on how to structure your controllers better. After the conference he published a new GitHub repo that contains the demo app he refactored on stage. The 4 main tips to improve your code come as PRs on the repo with a full description on why the change is valuable. Very cool stuff.
Using this convention as a "rule" is a good way to force yourself to keep your controllers from becoming bloated, and can often lead to learning interesting new things about your domain. For the presentation, I put together a demo app called "CastHacker" that showcases podcasts about software development. It's not a "real" app by any means (lots of imaginary features, no tests, etc.); it's just enough code to demonstrate the concepts from the presentation. Feel free to clone it and play with it locally if you like though. I've written up each refactoring I shared in the presentation as a detailed pull request.