Weve never really done much in WS with our kids, however on this last trip we planned to spend Christmas Eve day walking around there and checking out as many storytellers as we could catch. I didnt think my kids would enjoy WS or even doing those masks, but they surprised me. As soon as DS, 7, saw a mask he asked if they could make them so we did. Of course, my other DS(almost 4) wanted to because his brother was. They really had a good time coloring and couldnt wait to get to the next country to add on to the mask.
I will admit they werent extremely interested in everything else, but they didnt hate it either. We didnt really go in depth exploring each country, but we did do the 2 rides(Mexico & Norway) and the kids enjoyed those.
As for the rest of Epcot,they have loved that for years! I often hear how theres not much in Epcot for young kids, but even when my youngest wasnt even 2 yet he enjoyed the fish at the Living Seas, the interactive play area in Imagination, things like that. For years now my oldest has loved Food Rocks(Land), Universe of Energy, Fitness Fairgrounds(WOL),Living Seas, Innoventions...just about everything. I find there is alot of hands on stuff there and my kids really enjoy that.