Couldn't agree with you more Archowl. Ive already started using some of this info you gave me earlier in planning for this time of year. I'm hoping that the guide books and info on touring plans will help us get the most out of the visit
You are already so far ahead of most people it isn't even funny!

You will be fine and have a great time. It is the people who show up at noon with no tickets and no plan who will be majorly bummed out. And I saw lots of those people when I was there, lol!
I am guessing the park typically reaches capacity on the night of the 31st, is that right? If so, when you do think we would need to be in the park by in order to not miss out on the fireworks? I'm torn between doing our normal play in the morning and take a break vs sleeping in and planning on putting up with massive crowds the rest of the day... WWYD?
I can tell you what happened last NYE. DL was busy all day. Campers out in the Hub from 10am and on. Poor grandmas sitting all alone on their Cars blankets to save a seat for the rest of their family.

Disney was allowing camping as long as you weren't in the street in the Hub. They stopped selling one day tickets sometime that morning. In the early evening, they began stopping new entries to DL. The next phase was no entries at all, not even re-entries, which happened sometime around 8pm. Then they began allowing re-entries only, but the lines to get into DL were very long by this point, they stretched all the way back to the turnstiles at DCA.
DCA was very pleasant by comparison. No campers, since the midnight show was done before WOC. You did need to get a midnight WOC FP for the best view of the show, but these were available until early evening, surprisingly. The WOC area was great, because they don't pack you in like sardines, as they do on Main Street in DL for the NYE fireworks. They never closed DCA due to capacity on that day. DCA was a lot of fun, they had lots of entertainment and free party favors.

We exited the parks for awhile and had no problems getting back into DCA in the early evening. But we didn't have to find parking, so your experience could be different depending on where you are staying.
There were long lines for the tickets booths, so have yours in hand before you arrive if at all possible. Stay close so you don't have to deal with parking, I heard there were some bad traffic jams near the parking lots. Get there early and get your hand stamped if you can. Make reservations for table service so you don't have long lines to wait in for food, or eat counter service at off times.
I think DCA is actually much more fun that day and not nearly as crowded (well at least it was last year). So unless you just have to be in DL, give DCA a shot!