Quotestorm!
Except that Steven Moffat on Confidential after Time of Angels I think outright stated that that was the Doctor and River's second meeting. If not, then he heavily implied it.
In any case, I find it hard to believe the Doctor could manage something River would find that wonderful back then when he barely knew her, and also somehow manage to do it without kissing her at any point.
That could also explain why she was less angsty about the Doctor having never met her before in Silence in the Library, because they'd gone out of strict reverse order by that point so she didn't necessarily think that would be her last meeting with the Doctor, even though it was his first.
I disagree with the premise of your question. Yes, Who now has big season-long arcs, but that has in no way detracted from the plots of individual episodes in my opinion.
SpoilerI don't see how that's in any way related. If that little girl was Amy's daughter, she was taken back into the past and deposited in 1960s America at some point, and that's completely unrelated to Amy telling the Doctor about her being pregnant (earlier in her timeline). If your argument had any merit it would be impossible for the little girl to be Amy's daughter simply because the girl was already a number of years old as opposed to negative several months.
None in particular? It's just an arbitrary amount of time passing.
She also introduced herself to the Doctor in Silence in the Library as an archaeologist, and referred to it when talking about Nixon in the first episode. Anyway, what would be the point in her lying about that?
SpoilerIf that's the last we've seen of them, I will eat my fez.
I think it's just you.
Nonsense. Amy Pond is much better than Elizabeth Swann.
Also, just rewatched the last episode and noticed something: The Doctor said he has the strangest feeling the little girl will find them. As of the end of the episode, she has not done so. So that's something to possibly bear in mind for the remainder of the series.
Regarding the use of spoiler tags, I think certainly we should spoiler things for a day or so after the episode is broadcast, to allow for people being a bit late, or on the wrong side of the Atlantic. But we could possibly extend that a bit, to allow the Australians to discuss the previous episode spoiler-free within that window if they wanted.