If you are using Confluence, I'm sure you have extremely long pages, somewhere within your intranet. Anchors can make a long page more readable. You don't want to have to scroll through the whole page to get an overview from the many headings. Use draw.io to spice up a long Confluence page and capture the attention of your users.
You can add links so that when a viewer clicks on a shape or a line of text in your diagram, they can be taken directly to another page or diagram. And you can add tooltips, so when a viewer hovers their mouse over a section of the diagram, they will be shown additional information in a tooltip.