EPCOT back then was a joke. It was the 'boring' Disney park. The one your parents sent you as a punishment. With attractions that were outdated the day they were open. What the people of the 50's thought the 70's would be like.
Who pays all of that money to punish their children? My father had cheaper, far more effective methods. Disney, including Epcot, was really the only joy I experienced in my childhood.
The early memories of Epcot in the 80s as a young child I still retain are:
-The loading/unloading of the Spaceship Earth ride and how the platform constantly moves with the seats, and the steep incline/backwards decline at the beginning and end. The ride itself inside I retain no memory of, except it was dark and it probably gave both me and mom a chance to nap.
-The Living Seas as it was meant to be seen, the feeling of going down underwater in the "hydrolators", and thinking that the diver was going to drown in the entry/exit chamber.
-Living With The Land...but nothing else about that pavilion.
-The Universe of Energy's unique "ride" system. Oh, and something about dinosaurs.
-Saw the Monorail every once in awhile.
-Too young to ride on Body Wars, and stuck waiting in that pavilion with grandma for what felt like hours while others in our group were in line for it. Incredibly bored.
-Waiting around to see some movie about (or starring) Michael Jackson.
-The jumping fountains!!(!)
-There's the Monorail again!
-Don't remember how a stuffed Figment came home with us, but it did.
I have no other memories from young childhood of anything else or any other pavilions that would have existed there in the mid-late 80s...And the entire World Showcase may as well have not even existed. Considering I can still recall lots of other fun memories around the same age (and even earlier), including the Magic Kingdom, River Country, and even the hotels we stayed at on US 192, that doesn't bode well for the appeal of early Epcot for young children. Although I wouldn't go so far as to call it a "punishment"...more like "always relegated to Day 2" (if there was a Day 2).