We just went with my 6 year old daughter. She's usually not very sensitive but here's what she tried and how she reacted:
Splash - rode it twice and liked it but did refuse to go again for some reason, my 10 year old HATED it,
Space - she rode it once and hated it. I think it's because she couldn't see anything, both being short and it being so dark. I'm just happy that she tried it.
Indy - she was terrified to go on this the first time because she knew there were snakes. She loved it! She wanted to go again but it was our last day before she finally worked up the nerve and the ride had broken down for most of the day so we couldn't use our fast passes until it was nearly closing time.
Matterhorn - she went on this both this time and last time 2 years ago at 4 years old and she could take it or leave it. She didn't not like it, it just didn't excite her too much to the point she wanted to go on it again.
Goofy's - she liked riding in the back but not the front... I don't blame her
Haunted - she loves this ride. After POTC, it was likely her favorite
BTMMR - it was closed this time but she hated it when she was 4. Not sure if she would have gone on it this time even if it was open
TOT - wouldn't go on it because her 10 year old kept talking about how scary it was
Screaming - still a bit too short