Yes, this post did take a little while for me to get round to. Still, I got there before the next episode aired (just.)
It's not often people on the internet agree about anything, let alone Doctor Who, but it seems to have worked in the case of "The Day of the Doctor," the 50th anniversary special - and indeed all the surrounding programming spread around the BBC.
"The Day of the Doctor" by Steven Moffat, directed by Nick Hurran. Spoilers after the cut.