Although this experience does sound lovely, it is quite expensive - especially if you have more than one child to take along or find an alternative for!
For less than a quarter of the price, the Grand Floridian also do The Wonderland Tea Party hosted by Alice and the Mad Hatter. This is for children only - no grown-ups allowed (except CM's

) and children get a snack and a small gift.
DD has not taken part in this yet - I'm going to book it for her for our next trip. Although I can't comment personally, this does get good reviews here on the Dis.!
Hope this helps!