Instead of using the old method for inserting a card link (which is still an option), you can now type /card or /person in the editor menu and you'll get an easier way to search and embed a card and/or mention a person.

With either card linking method, you can now see the base and folder structure.

You can easily drag and drop these around the editor document, or you can click to edit the linked card.

This editor update also applies to tasks, action plans, and other places where this style editor is used.