re: It's not just the green skin.
The effects from Darby O'Gill were largely done in camera, using clever camera placements and sets with very few additional processing or matte shots, so naturally the realism was quite high. I'm still amazed by some of them. I was even more amazed when I saw the film for the first time since I was a kid a while back and realized that it starred Sean Connery.
I don't remember any CGI realistic human being featured in T2, although the liquid metal T-1000 was computer generated.
I agree that CGI is being overused in films, but its just so damn easy compared to the real-world techniques required to accomplish the same things.