In addition to being a great source of information before we left, it was a great read on the drive to Orlando. As parents, so much time is spent on the planning that the joyful anticipation of the trip is often left to the kids. The more we read and closer we got, the more excited we got.
One personal caveat that is inferred in the book, but not stated expressly is that the Disney experience can be lost on young kids. Our six-year-old had an absolute blast, our 3 1/2-year-old was a bit tentative about the characters and some of the shows, but our two-year old was scared by the characters (I don't think he understood that they would be life-sized) and the shows created sensory overload. Several parents of young children we talked to said they would not repeat the experience with a child younger than four. We heartily second that.