I think the reasoning your suggestions wouldn't work is because it takes people out of the "magic". I love learning more about behind-the-scenes stuff, but I don't think I'd like it 10 seconds after the movie ends. I obviously know movies are fake, but I don't necessarily want to be reminded of that... I want music and some graphics, while I absorb what I just watched.
There's two exceptions I can think of: Pixar's bloopers (which are obviously all fake) keep you immersed in the "world" (https://www.youtube.com/watch?v=mCBLywCKZmM), and real/actor pictures after a story based on true events.
This. End credits have evolved a secondary function as the In Between Time. You're still under the spell; here's a gentle transition back to reality.
It's a lot more bearable if you watch movies that aren't full of effects.
I want end-credits with inset-windows showing bloopers, for instance. Or fragments of the "making of". Or how about showing the faces of important people working behind-the-scenes at the very least? How cool would it be if a CGI programmer could have the opportunity to say something during the end-credits?