My kids did this in August and liked it, I liked it because I shoppped while the DH sat with the kiddos while they did the mask!! (Most of the stations are in a shop or next to one.) We did not encounter many waits. This was the first time we were able to go into all of the countries because my kids always grew tired of the World Showcase, but this gave them something to look for, it was almost like we were on a scavenger hunt!!
My DD6 also liked it because she was trading pins and most of the stations had at least one CM who had a green lanyard on with lots of pins! She wasn't as intimidated to go up to the CM at the stations as she was to the CM's who were just wandering or standing in the parks.