The Hangover and the Age of Jokeless Comedy
nytimes.com
nytimes.com
I agree with the OP, having a mix of these types of comedies is a good thing. Too many of one or the other type wears on an audience. I haven't seen "The Hangover II" but already I have concerns that it will be funny in parts yet depressing overall ("Very Bad Things," http://www.imdb.com/title/tt0124198/).
Some bros go to Vegas. They cut a little too loose. Consequences and comedy ensue.
In "Very Bad Things," the consequences constitute a hilarious tragedy. The bros' wickedness comes back to bite them again and again, and we laugh as their lives spiral into doom. The laughs aren't in Vegas, they're in the plausible consequences of partying too hard.
In "The Hangover," the consequences are puerile gags featuring overgrown man-children. There is nothing that could possibly depress you in the film. After all the mayhem, nothing happens.
After waking up to the evidence of multiple felonies and life-threatening situations, the broheims just walk back to their old lives. Everything that was funny about "Very Bad Things" is absent. "What happens in Vegas, stays in Vegas."
If people remember lines from Airplane! it's not necessarily due to the absurdity. They could just be good lines. Try remembering a line from any of the Scary Movies.
I enjoy the jokeless comedy a lot, but precisely because of its common irrelevant stream-of-though kind of dynamic and its lack of punch lines or gags in general, I can usually recall very few parts of these movies. I thought I was having memory problems!