DD is still only 15 months so can't speak for her yet, but thought I'd share my experience.
When I was 11 and my sister was 7 our grandmother and aunt took us to Disney World. They had planned out everything using a guide book and they were determined to follow that plan. My sister was up for anything but maybe a bit nervous. I was terrified though, and had to be forced on.
Now I know that that is not a lot of people's way of doing things and while I would certainly try to convince my daughter when she is old enough if she was nervous, even to the point of a bribe, I don't think I could just say too bad and drag her on the way I pretty much was. BUT, with that said, I am glad that my aunt and grandmother did that in retrospect. I may have eventually come around, but I may not because I do still have a serious fear of heights, but as soon as we got off of space mountain on that trip I was the one saying lets ride it again. I think that they both knew me well enough to know that I just needed to be taken out of my comfort zone for a moment, but not everyone is like that.
Like I said, I don't think I could just force DD when the time comes but I would certainly do anything else in my power to get her to try. I will say, though, that I think that they really got me amped up about the whole thing before even getting in line just by how they were acting about everything, which comes pretty naturally to my mom's side of the family, as I've seen her do that with my niece and nephew about things before.