I usually run into an extension of Example 1:

E: Where were you?
I: Went to see the new action movie with Dave
E: What did you think of it?
I: Not bad
E: What did Dave think of it?
I: Seemed to like it
E: Did you ask him?
I: No, why would I ask him?
E: Well, that's something you should do.
I: If you're that concerned about it, give him a call.
E: Well, that would be weird, he's your friend, not really my friend
E: Did you have popcorn at the movie?
I: Uh, yeah…why does that matter?
E: Oh I just want to know
Etc.

You mention concerts as a place where an introvert would seem to be uncomfortable. However, at a concert, no matter how many people are there you are actually quite alone. Everyone is focused on the band, nobody is paying any attention to you and it's way too loud to actually talk. That's why I love concerts and why loud bars don't really phase me either. They are places to go where you can easily be alone in a crowd.

The whole introvert/extrovert dynamic seems to mirror how males and females approach friendships. Males who are friends will typically talk to each other when they need to and if there is a large distance between them communication often dwindles to important life events only. It is just assumed that no news = good news. However, when they meet up the conversation starts right up as though they had just seen each other yesterday. It takes 10 minutes, if that to bring each other up to date and off they go.

Women need to know every detail of every small occurrence that is going on at all times. No news = OMG something disastrous has happened, why does she hate me, what am I missing?

And I think this modern version with augmented passive-aggressive, "nice people" tendencies are the worst to have to deal with. I don't mind it if an extrovert tells me that I'm a loner and I need to 'get out more,' and that sort of thing. Come to expect it, really. But it amazes me how quickly those passive-aggressive, 'bubbly' people turn into butthurt whiners when called out on their own behavior.

"ME?!? Too loud? Well, my gosh, I'm SO sorry. I'll try and NOT upset you again. I was JUST SAYIN' is all, not trying to be mean! Sheesh! You're too sensitive!"

(The irony of the 'you're too sensitive' comment from extroverts always cracks me up. Pot, meet kettle)

Rather more than once a week for me, mate. There's a chap who sits next to me at work who will make the most random and inane conversation routinely, simply for the sake of hearing someone else's voice. When he's working from another location, life is very good indeed- I can just sit there all day long and work, or web-surf, as required. When he's around, though, it can be quite painful.