Most of the meetings/conferences I went to ended with too much boozing and laughing about silly stuff and not nearly enough networking/exchanging ideas/helping each other to my liking. This was funny when I was in my late 20s, but I have different goals now.
Particularly, about the 'helping each other' part - I have the feeling that everyone is pushing their own agenda most of the time, and there is very little sincere interest in works of others - let alone helping/advising each other. More like 'let's get the compulsory presentation part down, do some quick networking... done? Let's get drunk'.
Maybe I'm visiting the wrong kind of meetings though. I'm guessing there's also a big difference between meetups in the US (never been to one, hence guessing) and in Europe (or elsewhere).