Share a dream at MK is the traditional parade, it is the one you are most likey to think of you think of a Disney parade. It is very pleseant.
There is the Stars and their Cars at MGM, this doesn't get as crowded, esp if you go round by the star wars ride to watch it, right near the beginning. I wouldn't go out of my way for this unless there are specifc characters you want to see such as Luke Skywalker and Chicken Little that I have not seen elsewhere.
The jammin Junggle Parade is at AK, this is fun and worth watching if you are there, but agian, I would not go out of my way.
The must do is the night time parade at MK, Spectromagic, this is the parade with all the floats that light up and is truly magical.