I never got to see EPCOT in its glory since I wasn't born until the 90's, but for me, every time I go, the size, scope, and structure of the original pavilions and SSE still wow me. The fact that a group of people were that talented to think up those awesome buildings in their unique shapes and configurations makes me long for the Disney of that time even though I never experienced it. Wodners of Life and Imagination are prime examples.
Photos of Horizons make me really sad I never got to ride it (that I can remember - although I do remember the original iteration of the Seas for some reason). I also remember Body Wars over in Wonders of Life.
Off topic, @marni1971 can you comment on the below picture - it's something I found through googling EPCOT 1982. Is this an accurate model of how the park was once imagined to be?
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Early concept art...but not far off...