Pandoc is awesome! One of my favorite usecases is for Orger [0], which I'm using to automatically convert data from different services into org-mode for easier local-first/offline search, navigation etc. Often API would give you markdown (e.g. Github), and while I could embed a markdown source block in org-mode, with Pandoc I can just convert it and display in native Org syntax.
[0] https://github.com/karlicoss/orger#readme