Our trips have all been amazing, the ages on the trips were DD#1 17 months, 2.3 years, 3.3 years, 4.5 years, 5.75 years, and we are going again in September when she will be 6.75 years. When DD#1 was on her trip as a 4.5 year old DD#2 started coming along at 4 months, then returned at 17 months, and will be 2.5 years on our next trip. Sure there are times when a meltdown may occur, but hey that could happen at the local mall, and there sure won't be a character around the corner to bring back the good cheer. We are a go with the flow family, we stay offsite and we don't return to our resort for breaks (our personal choice), that said the girls are used to being on the go and traveling. My DD#1 is old enough now that although she doesn't remember all of the trips, she will talk about some special part of a trip and all the sudden DH and I will realize that she's talking about one of the first trips WOW she does remember some of it, just bits and pieces, but the magic was there! Anyways DH and I remember, and what special memories we have of our little ones! It's definately a personal choice, but if you can handle an outing to the mall and/or a short trip out of town I would vote for GO TO WDW!
Kelly