TL;DR: Create better visualizations with premade templates, stencils, customizable shapes, and starter diagrams when you get ...

The workflow diagram is a consistent example provided by all GLSP components. The example implements a simple flow chart diagram editor with different types of nodes and edges (see screenshot below).

It also provides you some Process diagram templates that you can use to draw a flowchart in Excel. Just add a process SmartArt graphics and edit the steps for the process to create your own flowchart.