I agree, that cutscene, while cool, was flawed in many ways. Not just the graphical ones that earned me my current title.
Wait a sec...which cutscene? the FS2 intro with the Herc crashing on the planet?
EDIT:
Methinks it's important to remind you that in-game speed and universe speeds are two different things. The ships travel at slower speeds for gameplay reasons. Try fighting in a 300m/s fighter. It'd a pain in the a** to hit anything. They could have just used a bigger scale - the hud shows kilometers instead of meters, thus giving you an "illusions" of greater speed. But such illusion would be ever worse than the current situation - at least the scales work ATM.
Last, but not least, remember that in FS universe we got ships and transports flying to and from planets. Remember the vasuda Prime bombardment? We got a freighters leaving the atmosphere with fighter escort.
We got a Ursa sitting on the floor of the Galatea in the mainhall. How do you think it lifts off?
Some form of anti-grav, surely. FS ships do have artificial gravity without rotating sections. Put 2 and 2 together.