Epcot is divided into two portions: Future World and World Showcase.
At Epcot there are many rides with short wait times. In Future World, Spaceship Earth (the big ball) that greets you when you first walk in is many times quick to get on, even if the line looks long. The line moves very quickly as this ride like many at Disney World is on a continuous loop system. It is a chronicle through time and history with an eye toward the future. This attraction is a must-see.
Ellen’s Energy Adventure has such a large seating capacity that the longest waits are 20 minutes. The good thing about the wait is, it is inside, out of the rain, heat, or cold. This attraction lasts 40 minutes and is well worth your time. It tells about how important energy is in our lives in a fun, interactive way with Ellen Degeneres and Bill Nye as the narrators.
Innoventions is a walk through attraction separated into two buildings: East and West. Unfortunately, Innoventions West is closing and one attraction in the East building is closing. I have always enjoyed most of the attractions in the Innoventions buildings, but I know many think they needed updating. The future of the Innoventions West and East is still unknown. In the East building there are still a few attractions operating such as Stormstruck (a great interactive weather-themed attraction), Sum Of All Thrills (design your own coaster, but long wait for short ride), and Habit Heroes (forgettable).
In the Land building at Epcot there are two attractions that almost always have short wait times: Living with the Land, and The Circle of Life film. Living with the Land is a relaxing 13-minute boat ride that is informative. It chronicles the struggles with farming in the past and the future of farming with Hydroponics, Aeroponics, and Aquaculture. You see fruits, vegetables, and fish grown in unique ways. The Circle of Life is an ecological film hosted by the Lion King’s Pumbaa, Timon, and Simba.
In the Seas with Nemo there is one of the largest saltwater aquariums in the world that houses sharks, dolphins, fish and sea turtles (over 200 species of sea life). In another tank there are two manatees. These are walk-through exhibits and well worth your time. The ride in this building takes you through the Finding Nemo movie (or part of it) and the wait for this is almost always 5-10 minutes.
In the Imagination Pavillion the ride with Figment moves quickly and explores your five senses with Eric Idle of Monty Python fame. After the ride there are interactive exhibits that you can walk through and explore at your leisure .
In the World Showcase (the part with the countries), there are films to watch in the France, American, China, and Canada Pavilions. The American, Canadian, and China films are on screens all around you (a full 360 degrees) and feel very much like you are in the locations. The France film is less impressive and the Norway film is temporarily suspended while they are working on the new Frozen ride.
The Gran Fiesta Tour in the Mexico Pavillion is a fun ride featuring The Three Caballeros with normally a short wait. It is a boat ride that features some scenery from Mexico and The Three Caballeros.