Even with two full days, I can't see everything at EPCOT, especially during the flower show. We like to spend time at the Seas looking at all the fish and we do spend significant time in World Showcase, I like the entertainment and all the shops. We don't usually have time for Innoventions or to play any of the interactive games after rides like Spaceship Earth.
We generally take a break, either mid-afternoon or at dinner time and head out International gateway and go walk around the Boardwalk. This is especially nice when the parks are crowded and I am getting frustrated.