That is what I ment with the screens... they are clearly visible, like TV sets in space with images of eyes looking at you...I've actually ridden on Ghost Galaxy at HKDL, but not Rockin' Space Mountain. So, if you're not worried about being spoiled, here's what the ride is like:
You start off in pitch darkness for a second or two, and when you finally get to that lit tunnel, the lights flicker and just seem all-out broken. The music sounds broken, too. As you go up the lift, and at the top you see a projection of some sort of ethereal space demon, saying "You have disturbed my slumber! Now you will pay!" or something along those lines. He rushes towards you and disappears, and the projection screen he was on is raised up, and you pass through where he just was (I'm just guessing that's how the effect is done).
The main ride is pretty different, too. But I can tell you quite certainly that there are NO FLASHING COLORED LIGHTS. There's one part of the ride where you go through a tunnel of swirling green stars, but that's pretty darn awesome and not at all annoying. The biggest difference is that all throughout the ride, they have projection screens set up with images of the Galaxy Ghost on them, swooping about and grabbing at you. Some just have giant eyeballs that follow you as you zoom by them.
By the way, if it DOES ever come to DL, don't be too quick to judge the screens. When I first went on Ghost Galaxy, the effect worked perfectly, and the projections blended in with darkness of the rest of the ride. However, my rides at night weren't quite as good, since my eyes had adjusted to the dark.
I would definitely go as far as to say that the regular Space Mountain is more well lit than Ghost Galaxy. I don't even think there were star projections on the walls, just the ceiling.
EDIT: As for how it makes sense thematically, remember that Space Mountain is supposed to be the method of transportation of the future. In the ride, you basically make a wrong turn and end up disturbing some age-old evil creature, who then proceeds to chase you through space. There aren't any skulls or traditional zombies and ghosts on the ride, or at least that I can remember (sorry disneyNEWdad). The only things you see other than the Galaxy Ghost (who looks like he's part of space itself) are some eyeballs that pop up in a couple of places on the ride.
Feel free to ask me any questions if you're still curious about anything.
If only the projections or whatever they used were done in a better way to blend in with the surroundings the ride would have been better. Still it is a nice way to make a difference for a limited of time.