I don't mind what they did with Indiana Jones, tweaking the sound and making the print a great deal cleaner, but yeah, adding scenes and updating special effects is essentially memory rape to me. It's like the difference between remastering an album, and going back to completely redo all the tracks you felt weren't upto par and then remixing it.
I mean, every artist wants to go back and fix mistakes he made, but once you put it out there and say "This is my work of art", I don't think you have the right to change it.