One thing that has not changed since June 1973, when these photos were taken, is The Magic Kingdom still has Parades. Although I think they have changed just a little over the past 40 years. :-) Costumes for the Magic Kingdom Main Street Philharmonic (I don't know if they were called that in 1973) have changed and the characters in the parade have changed somewhat. Floats in the parades are nowhere near the same.
These photos are from slides taken by my wife's uncle. Check the links below for other slides in this series of 1973 photos.
Now what time is the 3 o'clock parade?
These links are to additional photos from the same set of slides made in 1973.