We're not huge collectors but I have taken to buying Christmas ornaments for all of our vacations including the 2005 cruise.

I'm sure I'll get one this time, too! Hubs also drinks scotch and he fell in love with the scotch glasses at the Cadillac Lounge, so we've decided we're going to see if we can purchase them this time around.
As for there being anything I wish I had known before hand, there are some things - but if you're reading here you probably already know them all! Mostly we didn't plan our vacation very well the last time.
We didn't read the boards at all last time and were unprepared. We didn't really discover the whole Route 66 section of the ship until our last two days and we really liked relaxing in the Cadillac Lounge. During the day it was so peaceful in there and we enjoyed sitting next to those huge portholes and selecting whatever we wanted to listen to on the headphones. I highly recommend that if you want to relax with a drink and get out of the sun.
We did catch the Disney Dreams show which was just great. Our daughter was 4 at the time and was enamored with it. We're looking forward to seeing Toy Story this time.
Our youngest was barely 2 and we spent a lot of time getting him in and out of Flounders. As far as Flounders went, we were told prior to our cruise that we would only be allowed to have him in the nursery for I think 6 hours for the entire cruise. I was happy to find out once we boarded that we could have him in the nursery for much longer. Hubs and I really needed the time together!
The whole family (the adults, so 8 of us) all had dinner at Palo one evening and they sat us (I assume because we were a larger party) in our own private room. It was safely the most amazing dinner I have ever had. Our server, Biata, literally knew what we wanted before we even knew we wanted it. She was incredible. Hubs wanted to take her home!
I'm looking forward to spending more time at Castaway this time around since last time I felt really rushed there. I'm hoping we'll be able to plan things a little better with the navigators now that all our kids are a little older and will all be able to go to the Oceaneers Club and Lab. Our 8 year old son is so excited he'll get to go to the Lab this time!
Overall, it was the best vacation we've ever taken, even though we could have planned better. I can only imagine that this time will be even better. Our servers and room attendant were top notch and made us feel so comfortable. The only minor complaint I had about the service on the cruise was that the last morning it seems that everyone is so rushed that you sort of get the feeling you're a guest who has overstayed their welcome! I imagine they are under a lot of pressure that morning and even still our servers took the time to smile for pictures with us and were incredible to our kids.
Geesh... did I just write a book?