Hi Lesley!
I LOVE the Unofficial Guide to Disney World - I think that I have read it cover to cover! I, personally, have never followed their touring plans because I was fortunate to visit Disney World so often before I had my kids and I already knew the lay of the land. However, for those moms (and dads!) that want to pack as many attractions as possible into a short time frame, these plans can be priceless! Although, if you have at least four days at Disney World, I wouldn't kill myself trying to follow those plans precisely. Rather, I recommend scouting out the attractions that appeal to my family and creating my own plan using the official
Disney website. You can even have a FREE customized map sent to you with all of your faves!
As far as crowds are concerned during your visit, they may be a little larger due to the "Buy 4/Get 3" promotion that Disney offered during that time. Don't worry, it will still be WAY less crowded than holidays or summer. It sounds as though you have really done your homework - you should have an amazing time! Oh, you may want to bring your Unofficial Guide along with you to reference during your trip - you never know what questions may pop up!
Much pixie dust,
Jackie S.