Spaceship Earth is a VERY (read V-E-R-Y) SLOW Omnimover ride. Other than some flashing lights here and there - there's nothing to it - but to sit and look at some subtle animatronic scenes of various "historical" moments in the development of communication. It's very much like a Fantasyland Dark ride, except the theme is technology and the development of communications.
Mission Space is quite different and 'somewhat' intense. Though I expected much - MUCH worse, (I rode it a few times last week for the first time) it's mostly just getting plastered against your seat with some continuous force. If you (or they) can't handle tight dark spaces and a few G-forces pressed against you for 8 or 10 seconds at a time - you may want to steer clear. It's not as bad as many people made it out to be (at least not for me) - I expected it to be 100 times more intense than it actually turned out to be. In fact, I ENJOYED it very, very much.
Rock N Rollercoaster - I rode this for the first time last week (several times). I despise unexpected and intense drops (i.e. Tower of Terror) but this ride has none of these. It has a fast lauch - I have no problem with POSITIVE G forces - it's the unexpected NEGATIVE G-FORCES (drops) I sometimes have a problem with - this ride has NO sudden or unexpected drops and almost NO negative G's that I could sense. I, personally thought it was quite tame for a rollercoaster - no more intense than Space Mountain. You are upside down twice on the ride but you are moving so fast you barely notice it.
Obviously, I don't know your child - but the only Disney ride I know I should steer clear of is Tower of Terror - and ONLY because I don't like unexpected drops (or downward pulls). The feel of PUSH or THRUST (POSITIVE G's) doesn't bother me in the least, but I do NOT like unseen or unexpected downward (Stomach in your throat - NEGATIVE G) experiences.
I think that if your child has no problems with Space Mountain they will like Rock N Roller Coaster - If they CAN'T deal with Space Mountain then Rock N Rollercoaster is out of the question.
Hope that helps . . . . some .. . .
Sad to be back home.
