You've brought up some interesting conundrums Mod. I'd always had this vaguely thought out picture of heaven (as more vaguely suggested by some Christians) as a place of unending boredom. You've made it a bit more interesting a question than that.
I think that Christians don't get what "eternity" means.
For one thing, anything you do in heaven, any conversation you have, anything at all, you will end up having to do again. Then again. After the 100,000 time it might be a bit boring, no?
I think Christians have a picture more like a constant state of drugged out stupor so they don't mind this. But as, we see here, they don't really have any picture of what heaven will be like.