Just responding to WeloveABD's comment -- we have cruised twice on Disney, and loved every minute of it. But for whatever reason, there were not big Disboard threads/presents etc. on our cruises. We were pretty much on our own as a family, except for a few times one of my kids met up with a girl she met on DIS. We had a fantastic time.
In comparison, on our ABD trips, we bonded closely with many of our fellow group members, and felt pretty darn close and friendly with almost everyone. In our free time we often hooked up with several other families/couples and went out to dinner or touring together. The ABD trips had far more closeness than the cruises.
That said -- there does not seem to be a tradition of gift giving to fellow ABD group members. That seems to have grown out of the fact that there are so very many people on each cruise, you can generally find a bunch on the DIS to plan/anticipate with. On an ABD, however, there may not be anyone in your group who has ever been on the DIS boards (except you, of course...)