I didn't "get" Epcot at first either. I thought it would be boring and didn't schedule nearly enough time there, so of course, I had a rotten time. Mindset counts for a lot. My first time at Epcot, I didn't know there were any RIDES.
Epcot is, more than anything, about expanding your horizons (pardon the pun). There's way more to our world than many people know, particularly many of us in the US who really live in our own little world here.
As I have started to travel more, I've grown to appreciate World Showcase. It really is a celebration of nations. It's also great when you learn that the cast members in World Showcase are from those nations, and they can tell you what it's really like. Those conversations can be priceless.
For some people, though, that's just not a big deal, and they're never really going to appreciate it. They don't care to travel much, don't like "exotic" cuisine (It's NOT that exotic, trust me), and the entire area holds no appeal. For them, I'd say do the Agent P adventures, ride Maelstrom and the Gran Fiesta Tour, grab a bit to eat at the least offensive place you can ... but do it for the kids, because maybe they'll appreciate it more. The younger you expose them to a larger world view, the better off they'll be for it.
Future World reminds me quite a bit of the Pacific Science Center we have in Seattle. You're going to learn and have fun doing it. Again, the rides are there to give you something to do, but if World Showcase is about our world as it is now, then Future World is about the world as it could be in time. And again, do it for the kids, because the sooner they learn about things like conservation, energy, etc. the better off they'll be in life.
Future World has most of the rides, so there's actually a lot to do here. But if you just want to experience everything once, you could do all of Epcot and be back at your hotel for an afternoon swim. Of course, you'll miss how amazing Epcot can be when the sun goes down.
Frankly, I think you could easily spend two days at Epcot, one at Future World and another at World Showcase. But this is only if you take a concerted effort to slow down and appreciate all the details (thanks Lou). But I can certainly understand the people who like me, just didn't get it at first. You really do have to go into it with a different mindset and appreciation for what the park represents.