I am really having a hard time seeing the value in this. All of the mentioned hosting services provide control panels that allow you to quickly provision a server. Running git pull from Github is pretty simple. I love Laravel and want to support Taylor but I'm just not seeing the benefit.
It's not simply provisioning the server. It's also installing all the relevant packages, configuration, and deployment. The value is toward people who don't have the sysadmin/devops skills (or perhaps time) to manage that themselves.
Chef/Puppet are way too hefty for many small sites/devs. There are a lot of devs out there still setting up servers by hand who'd jump at something like Forge.