The vision is that the cost per unit of mass to orbit will come down massively with Starship, once it's launching like the Falcon. That will open up hitherto unimaginable missions and markets. And customers. It's all about the the cost!
With the Starship, there will be single payloads of 100t or more - Elon is even talking about 200t in future versions. That is a total game changer. A station like the ISS could be set up much quicker. You could start designing real spaceships with e.g. ion drives. And a 100t payload might even cost less than currently a single F9 flight.
Imagine if what you put in orbit (or indeed into deep space) was limited by your imagination, not by the very limited capability of launch vehicles.
I would not be surprised that most revolutionary thing that this level of launch capacity will enable hasn't even been suggested yet.