Hi - I don't like rides either, and was a little nervous about going to Disney for the 1st time xmas 08 and having to wait at every exit for the family. I can't even sit in the back seat of a car without feeling oogey.
Was I suprised to find out that many are "attractions" where you literally sit there and look at stuff while a little cart type thing takes you along a track about as fast as an escalator. I'm writing this hoping to reassure your DW that there are really only a few "real" rides, and even they're very tame. There are a lot of wonderful 4d shows where you sit in a theater too.
I hate rides and went on every single thing. Really! They were all tame, maybe with exception of Everest, but I even lived thru that. Where I felt the most sick as in those Star Tours motion simulators - they don't go anywhere, but move around a lot and while you see images on a screen. I just closed my eyes and lived thru it ok.
Hope this helps a little - because if she isn't riding, the exits are not near the entrances on just about everything. It will be a bit of a pain if she's always having to find and wait around at an exit.
Feel free to ask me about any particular ride - I went on just about everything.