Even so, you can still create a web framework which applies best practices and organize the code and files. Even if packages is the only structure that can be used for code organization. But dont forget that go has interfaces, you can do seperation of concerns with those.
In addition the framework could provide functionality to easily get started with web developing.
For example, say you have a web-framework shell, typing "gonk create" would initialize a new web application with the gonk frameworks way of developing web apps. creating folders, configuration files, an example controller, example dao files etc. etc. That would certainly be a faster way of getting started than having to create your own structure.
There could also be implemented a plugin functionality which provide the ability to download existing (open source) components and couple them with your application. Yet again saving time and cost.