First,

to DISboards!
As bigbabyblues said, every country in the World Showcase has some entertainment in addition to the attractions.
I think allears has one of the best summary for Epcot that includes the various entertainment:
http://allears.net/tp/ep/ep.htm
Follow the links for more information on each of the countries.
Depending on when you visit, Epcot hosts a number of festivals like Food and Wine in the fall, Flower and Garden in the spring, and the Festival of the Holidays and the Candlelight Processional around Christmas.
I suspect you'll find a lot has changed in thirty years.