Why are there always roller coasters?

I am not a fan of roller coasters.  Never have been.  It is very frustrating because sometimes they pop up in places you don't want them to.

Examples:  

1.  In Spain, our group went to an amusement park.  There was something similar to an Imax where you feel like you are part of the movie.  You know what I'm talking about.  Then all of a sudden, right in the middle of it is this big roller coaster thing.  I was freaking out so bad on the inside (but amazingly enough I don't think I really showed that I was freaking out.)

2.  Mario Kart for the Wii.  Driving along and then all of a sudden the road drops down sharply.  Let me just say that it is very hard to stay on the track when you have your eyes closed.

3.  3D movies.  This is what made me think of writing this post.  In March at Showest (annual theatre convention) we got to see Journey to the Center of the Earth 3D.  I must admit that I think that this is probably the best 3D movie that I have seen.  It was very well done.  However there was one scene that it was just like a roller coaster.  I was so visibly uncomfortable with this that Zaq was just sitting beside me laughing and telling me when I could open my eyes again.  There is a scene like this in Polar Express too.  Just because your movie is in 3D does not mean you need to include a roller coaster!

I know a lot of people do like roller coasters, but I know there are people other than me that don't like them.