I'm not a big coaster person for multiple reasons but Everest isn't really intense/scary. I've never been on Rock and have no interest in going on it, but Everest is fun.
The only real issue with Everest is the part where it goes backwards -- that gave me horrible motion sickness last time I was on it, to the point that I may not ever ride again.
I felt sick on it in October, first I've ever felt like that! We both did. Honestly I think it was because it was hot, we had on masks and couldn't feel the air on our face - it makes a big difference.