Awesome write up, man! A buddy of mine just recently had this problem. I'll make sure to pass it on to him!
When I did this, there was water half way up the cabin filter, so there was a ton of water just sitting there. I'm horrible mechanically, but this is a very easy thing to do.
My son just called me to tell me about water pouring out from under the dash of his 06GT, as soon as he got it out of his mouth i told him to get on this site and look this thread up and all will be explained.
Thanks for a great and detailed write up.