Years ago, I had a homebound teaching assignment for a girl who had such severe vertigo that she couldn't walk, couldn't leave the house. Another girl in a body cast from a severe wreck was actually more mobile.
Only problem I've ever had was once while riding in the back seat of a car going down a twisty mountain road with tall trees on both sides. Funny, though, I have no problem if I'm riding in front seat or driving. oh I guess I did get dizzy once when I was climbing a bridge on a windy day...won't do that again. I can't imagine getting that sensation just from branches swaying. Wind never stops blowing here, so that would be devastating! Sorry, Zuzu.
On another note...does anyone grow Summer Snow? I just bought it, and helpmefind says it's thornless. I see a few thorns on this one.