I think http://allthetropes.wikia.com/wiki/Creative_Closing_Credits has a good list, but maybe I'm just misremembering - could've been Episode 8 with a silhouette of BB8 chasing through the credits, or maybe it was GotG2 with Groot - maybe I'm blowing these "special" things out of proportion and 90% of movies don't do this ;)
Pliny talks about the "chasing prestige" trap in our IH interview. This is how the film industry de facto operates, and we only managed to avoid the trap by approaching things like a software company would -- itself mostly an accident and byproduct of our backgrounds. Lots more opportunity for software to "eat film" imo.
Note: Endcrawl does let you carve out areas for a video inset where you can add things like blooper reels. Compositing those into the scroll is still something better done in your NLE timeline. Can't solve all the problems!
Bigger productions will hire a title designer to do the opening credits and the "mains on end." Then there's the scroll, which is where we come in. Some title houses sub that part out to Endcrawl because it's fiddly and not terribly creative work. (It is, however, surprisingly tricky to get a readable, smooth, and artifact-free scroll into a variety of deliverables.)