Like for some people, it depends on the film and in some cases, the crowds. With most old TV shows, they usually have interesting credits to sit through with memorable ending themes or interesting text designs (and don't come up so fast you cant read the fuckers). Current TV shows I don't care for because most:
-Have video-like credits on black text with bland text and names I don't have enough time to read (This is where the players pause button on DVD and BD releases help)
-And bland and generic themes that make you say "Not sitting through this, NEXT EPSIODE!"
If its a shitty movie or a decent flick that has a ear grating song during the credits, I'm out even if crowds are there. If its something I like, i'll stay not only for any surprises after the credits, but to watch all the punks and bozos that text and blab their asses out, or do something really stupid like shit on the chair or spew out "this movie is gay" remarks. In most cases, I usually wait till the VHS/DVD/BD release to get a real grasp on all details on the credits.
I remember when I was about 5 or so, my parents and I saw the 1st Rugrats movie at a Regal Cinema theater and, believe it or not, I made them stay through the credits to see if this company logo (https://www.youtube.com/watch?v=ZdO90sxSBiU) appeared after the credits. Oddly enough, this one (https://www.youtube.com/watch?v=90U0dYQDft0) appeared instead and while I wasn't startled (this one was a known scary logo that made kids cry), all the kids in the theater were screaming and crying bloody murder over what they just saw. Then my dad was yelled at me because I made out whole family stay though the ending credits and crying kids with frantic parents. I was crying like mad not because of some logo, but because of getting yelled for this credits obsession I have (still to this day somewhat).