While I didn't attend opening day of Epcot on October 1, 1982 (while living in NJ, I didn't even know it was being built), I did go during the mid 80s, and had the opportunity to go on its 25th Anniversary, October 1, 2007, as a Florida resident passholder.
That day, to say the least, was magical and emotional. I heard several speeches, including one from Marty Sklar, listened to the original music of the park (especially enjoying "Listen to the Land"), and watched as water from each of the 11 countries' lakes or rivers was poured at the same time into the fountain. Many Epcot fans standing around me had tears in their eyes. One even had her original ticket from opening day. I took hundreds and hundreds of pictures and lots of video, and looked at the timeline and mini expo (which has since closed) containing items/posters/uniforms/videos from Epcot's early days. I bought as many Epcot 25th anniversary pins as I could.
While I am an Epcot fan for sure, loving the mix between technology and world culture, I've decided not to renew my annual pass, which expires on 04/30. It has simply morphed into something that hardly resembles Walt's vision, in my opinion, and has become too commercial.
I rode Soarin', saw Turtle Talk with Crush, and watched Impressions de France for the last (and probably the 200th) time, still so inspired by the film despite showing its age (Citroën CX on Paris boulevard, for example) that I decided to get a Kir Impérial at the outside kiosk, and then a quiche lorraine (they were out of pissaladière) in the patisserie/boulangerie, enjoying a wonderful conversation in French, while my quiche was being reheated, with the young French gal behind the counter who had a few more months in Epcot before turning to France. As I sat down next to the fountain outside, enjoying every bite of my quiche, I watched Disney guests as they walked by, knowing it might be a long time before I do this again.
Epcot, in my opinion, should be about technological advances and world culture, not movie tie-ins. There's plenty of room for that in the other 3 parks.