Uber surely is a great app. But if we think in terms of harnessing computing power i really don't think it falls into the same category as early GUI or OOPs. They definitely have to work real hard for managing the non computing side. But if you concentrate just on the computing side it is just a scalable web service allowing user to book cabs. And it was nothing that couldn't have been conceived in 2007. Far more complex air line booking system existed before that

Only real example that comes to my mind is PA kind of applications of the type of Google Now/Siri. But still they don't work to the level we desire them to