Sometimes you do and sometimes you don't get the survival kit. If you are going to get it you should get it in the mail shortly after your cruise. I also get mailings on occasion with various receipes and idea. I used two of my post cards for door signs this time around. Very good idea I thought.
Once you have gone on Disney they keep you information. If you do not get a castaway club card all you have to do is call and they will give you your number. Once you have this number you can use it when you rebook to give to your TA.
DCL should not have to have it if you book with them.
You also have a special phone number for CC members. I like this because you normally do not have to wait a long time.
You do have the special line for check-in at the terminal, but like OP stated it is not always the best line to use. Nor do you have to use this line. All it does for a CC member is speed your process if the other/regular line is busy.
You do get the advantage of booking your on-line reservations earlier than a new cruise. CC members can book on-line Palo, Spa and excursion 90 days out. Concerige is at 105 days out and new cruiser are 75 days out. This is only if paid in full.
You do get a gift that is normally on your bed when you first get into your room. The gift can vary. Sometimes it is a towel or bag. For special itinerary cruises you normally get a special gift as your CC member gift. For our Antigua sailing last year we got a very nice beach blanket with the itinerary on it. This year it was the white beach bag.
The CC Cocktail party is normally at Cadallic's and will have a over flow into another lounge at times. You are served Bahama Mama's and non alcholic drinks as well. You have a nice selections or snacks as well. The senior officers are at this party. You normally receive you invite a day prior to the party along with the CC member pins. We did not get pins on our last cruise. Our room server was a little slack and never left anything in our room. He just put it up on the fish that holds mail outside our room.
Txsleepingbeauty, yes on your second cruise you will be a CC member. If both are already booked you might want to call after your first cruise in January and get your CC number and make sure it is noted on your May cruise.
Kristen821, yes the kids can go to the party. My children loved it. They liked the food.
We did not stay long though.