I've been on some of the biggest coasters out there,200,300,400 feet tall,80-120mph and I'm fine on pretty much all of them.Most of the highest fastest ones are probably my favorites and I've never had any issues with them,rides like Cedar Points Millenium Force at 310 feet tall at 93 mph or a Sheikra at Busch Gardens Tampa with a 90 degree drop from 200 feet at 70 mph are examples of some of my favorites.There's probably 10% of the 120-130 coasters I've been on where I might have an issue riding them,I'll still ride them but I limit myself to riding them to say 2-3 times in the day.Amazingly two of those 10 rides or so are Everest and RnRc,for different reasons.For example Everest is probably the only coaster I actually get dizzy on from the backwards part,my 65 year old mom rides it with no issues but I get dizzy.RnRc is not really that bad, the only real issue I have is a little head banging during the corkscrews,I'm probably exaggerating putting it on my 2-3 max list.Other coasters I have issues on are Manta at Sea World,I don't like the way the restraint restrains my legs,for whatever reason I have an issue with this restraint system,I worry if the coaster gets stuck with me in that restraint I might have a panic attack.The only coaster I told myself I would never ride again was the Manhattan Express coaster in Vegas,I believe they changed the name of it but simply put it's an unrideable coaster,incredibly rough.Another coaster that changed over time from rideable to unrideable was Gwazi at Busch Gardens Tampa.I remember it being rickety and fun but my last ride on it I felt lucky my internal organs were still intact,again,out of control rough,the coaster has closed for future additions so I guess they realized it was unfixable,they did try and even changed the trains and fixed the track to no avail.My point is that you can never tell how you'll handle it until you ride it,you might have issues with things you don't even think about like a restraint system,but for the most part Disney coasters are very tame compared to other coasters and most park goers can handle them,so I would try them and then decide if you want a second ride.