Funny how different kids (and adults) can be. On our first trip to WDW my kids were 4, 7, and 10. I brought the 10 to Alien and she wasn't bothered at all by it. I knew my 7yo would love it, but he was scared because of all the warnings and I ended up bribing him. He went and liked it a lot. The next visit my then 4yo was now 7 and I bribed him to go. After it was over he said, "that was it?". He's not exactly the bravest kids, either, but I guess wasn't scared by that type of scary. It will be interesting to see how Stitch will compare.
T&B