It would be very useful to be able to put as a link in a page or assignment (using the "Links to other content in the course" on the right of those editing screens) a link to whatever the student has not completed - the next page or assignment in the module list. This would let us make 'continue' buttons on a home page or other place that would put a student back into the flow of a course without worrying too much about them navigating a complex module list. It might be a good left navigation choice as well.
It may be a small feature, but I think it would really lower the learning curve for students, as they'd be able to pick up where they left off more easily, without having to think as much about navigating Canvas, and then return to the module or assignment page when looking for something specific. It would also enable designers to implement more complex module flows and dependencies, or tightly integrated class workflows, without worrying as much about getting students lost in the menu.