Very tough to predict what kids will love or hate especially when they are not your own.
While another poster said to avoid T2-3D yet said everything at IOA is fine, I would debate that because I think Spiderman would be much more "threatening" on a personal level to a child because in Terminator the characters are chasing each other while the bad guys on Spiderman are trying to destroy the scoop you are in.
Then again Terminator characters are human and robot while Spiderman's are comic book, and your kids may hate or love both, only you would know, and even then kids have a way of surprising us!
I have an 11 year old with autism and he grabs my arm when he gets spooked. He's proved my guesses wrong many times, loving Twister, laughing at King Kong, wanting to ride MIB a million times, totally unimpressed at Jaws.... Going on the level of how hard he grabs me I would avoid Back to the Future because of the frantic pace and simulated drops and explosions.
So bottom line (sorry I tend to get wordy)... Listen to your kids, start with characters and situations familiar to them (Nick studios is a wonderful start and right at Universal's front gates). Both parks have much to do and see on so many levels, take your time and push your limits a bit.
I don't think any of the rides or shows are too traumatic for anyone over 5 years old but then Woody Woodpecker scares the bejeebers outta me... go figure
