Well, yeoman provides 3 tools: Yo, Grunt, and Bower.
The first handle boilerplate and scaffholding, the second automation and the third is for 3rd party libraries provided to the browser (npm/gem/pip for the browser).
They have a catalog and as soon as you have choosen what you wanted inside, it keep things updated, clean dependencies, etc.
The thing is, you still have to do the choices yourself. So, as a newbie, you quickly find the profusion of packages overwhelming.
So, assuming you want to make Hackathon Starter and you know how to do it you could:
1. Use this Generator: https://github.com/lukelarsen/generator-node-express that will boilerplate + scaffold your backend
2. change the rendering engine in server.js to Jade
3. Install front-end componnents: (do `bower install <component>`
* font-awesome
* lato
* jquery
* bootstrap
4. Then you'll write these nices views because that can't be generated. That's where the value of this project is.
5. This yeooman generator doesn't provide passport (auth system for Node) so you'll have to write it too. Maybe i didn't pick the best generator, sorry for that. Again, the project has lot of value with the working Passport system.
6. Glue things together with Js and CSS in the front-end, because that can't be generated neither.
There is work in this project, and yeoman is not the silver bullet. Just another tool to make things faster.