We went for the first time last November and enjoyed it --- just because it was something different. In addition to about 20 food stands with small servings of food from many countries, there are special lunches and dinners. But everything did seem to combine both food AND wine, and we don't drink --- so we chose not to participate in the special meals. There were also cooking demonstrations under tents, which were fun, and programs on wines, which we skipped.
We thoroughly enjoyed 'eating our way around the World Showcase' and did lunch and 2 dinners this way and tasted pretty much everything we wanted. Think of it as "sampler size" not samples. There are not samples, with the exception of a small taste of wine or beer that we saw some folks get, to try to help them decide if they wanted to buy it. The foods are for sale, and the cost can add up fairly quickly. Even though everything was just a "sampler" size, we usually split the servings so that we could each try a lot of different things.
We're really glad we got to experience this and would like to do it again. Someone with kids can give their opinion, but I'm not sure it would really appeal to most kids.