I went to Epcot twice when it was EPCOT Center and twice it was Epcot. The first time was back in January of 1983. The second was in June of 1989.

I think that while Epcot still isn't perfect and it does take a lot of work to keep things current, I think the current incarnation is a good mix of old and new. A place like Epcot can get stale very fast. At least putting some educational thrill rides into the mix allows them to bring younger people into the park to experience things they may rather bypass.

One of the problems with a place like Epcot is the Imagineers have to be proactive in their upgrades. If not, you could have an attraction go stale and it take several years to get in a replacement. This can plainly be seen with The Wonders of Life.