We are taking my 2.5 year old son to Disney in January. He is 36" tall right now and I will expect him to grow another inch or two by then. I plan on taking him on all the kiddie rides and then on the suble tame rides like Pirates of Carribbean, Jungle Cruise, Kiliminjaro Safari, Buzz Lightyear, Midway Mania, etc, etc. Though plans could change once we get there depending on my son's mood.
He won't get on rides like Tower Of Terror, Soarin, Dinosaur, or any roller coaster. I feel those rides are too big or too fast for him. Even if there was a ride in which he met the height requirement, if the rides jolts you quickly or seems very fast or even too scary, then I wouldn't think it is a good idea. You never know how a 2 year old will react to something. For example: At home he may love Halloweeen and seeing people dress up in scary masks, but you could put him on the Haunted Mansion ride and he may totally freak out, because of the dark, the music, the skeletons. Who knows. Toddlers are so unpredictable.
You should jsut play it by ear, I guess. There are so many things to see and do other than the rides also, like shows, meeting characters...
I wish you much happiness and magic while on your trip and always.