Kilimanjaro is rough. I usually sit as close to DH as I can and he helps keep me still and helps to prevent jerkiness.
I found that on Big Thunder when I squeezed in one car with my two DDs (DD8 was scared) I didn't move around nearly as much. It was better than the first time - that time it was just me and DS and I was jerked around ALOT!
Also on Splash DH and DD and I all squeezed into one seat. Again this really helped.
Star Tours - I brace myself there to. Scoot bake into the seat as far as I can and hold on. Of course now I know the ride so well I know when to expect things.
I had no problems on Everest or Rockin' rollercoaster (other than my own fear of going upside down

)
Another tip - after you see a show (Fantasmic, Indy, Beauty and Beast, etc) wait for most of the crowd to leave. The worst injury I had was leaving Indy - some woman couldn't control her
ECV and slammed into the back of my chair. She thought it was funny. I hurt so bad it brought tears to my eyes.
Also the trolley tracks along main street are killer!! Be very cautious around them!!
If I think of anything else I'll let you know!
Kimba