I can think of two major, useful new features in desktop GUIs in the last, oh, 20 years? More? And both existed before they went mainstream anyway, I think. Both are basically just search: launching programs by search (replaced program-launch menus all but completely for me) and deep search in deeply-nested menus, guiding you to the item at the current level that contains what you need (as in the macOS settings menu—I've actually not seen it done well anywhere else but I want it everywhere that kind of navigation structure exists, having seen how nice it is there)