Source, Destination, Export. That’s it.
Or a few more clicks to get more granular. For instance, whether to export folders by year or also sub-folders by month. Original photos or edited. Retain the photos’ custom organization in albums, or export in default order. Export only photos, only videos, or both. Keep metadata, including the titles, descriptions, keywords and locations that you have added via Photos (or remove it all). It can even mirror your folder-album hierarchy in the exported folders. Far more flexible and efficient than Mac Photos app’s native export functionality.