I'm 5'10" and I have issues with Space Mountain (I have long legs even for my height). I have noticed though that the front seat has a tiny bit more room. Also, it's so much fun and the ride isn't too long, so it's bearable for the enjoyment of the ride.
Goofy's Barnstormer was okay, not too uncomfortable.
EE was fine (they made the cars pretty much like BTMRR).
RnR is uncomfortable too, jammed in there really tightly.
Be comforted with knowing that no one will obstruct parade viewing!!
peace,
figgy