The mid and end credit scenes are really just a way to get you to read all the names of the people who made the movie. That, and see job titles didn't know existed. You will then wonder how much an assistant food dolly gripper makes and if it's the right career movie at this point in your life.
The end credit scenes have never been so good that it makes it worth the wait, and yet I still watch them all. Just leave the theater! Then go read a fanboy website that will explain and or theorize what it all means. Then hear them rant about people are bandwagon fans and they didn't read the comics growing up. Well, you are right, I was too busy pitching no hitters and hitting home runs in little league when I was a kid. Now I can just watch the movie.