Thank you! That's how I feel too. It's especially fun watching it at different times of day - seeing videos from sunrise and morning commutes on the other side of the world!
Fullscreen is an improvement I would like to add soon. It wasn't working well during development because I actually run it with two video players - with the hidden one loading the next video so that the cutover is quick.
The videos are shown at their highest-possible resolution in the window now, though, so at least we aren't missing out on any quality (though it would be great if Instagram allowed users to upload higher resolution source videos).