Andrew, I don't completely disagree - but remember, you're coming from the prospective of having seen it many times. There are still many people seeing WDW for the first time.
I think SE is iconic. I don't expect everyone to love it, but I think it should remain reasonably sacred - it is and always has been Epcot's signature element. And again, try taking a step back and trying to look at it with fresh eyes. Take a closer look at the tiles. Look at it from near one of the supports. The building itself hasn't changed, it's only your prospective that has.
If you want, compared it to the Contemporary Resort. Some people can't stand it, while others love it to death, even forgetting about the convenience of the monorail. I'm definitely in the latter camp; I grew up looking at it - and even staying there a couple times, but only ever in the garden wings

- and it'll always have a special place in my memories. I'm really excited that they're almost certainly building the next DVC there, I really hope that it complements the main building well.
As for the rest of Future World... it's funny looking at some of the older brochures and things, I think the
only thing left that was vaguely like it was when Epcot opened is SE. And most of The Land, I guess. (And the carpet sure looks original, too! It's time for a new carpet in the bottom floor of The Land, Disney...) No more Horizons, World of Motion, Journey Into Imagination, Universe of Energy, CommuniCore, or The Living Seas. Innoventions is fairly dull. (Though admittedly, I probably haven't given it much of a chance.) The current Imagination ride is dull and I really hate when they think it's funny to blow a rotten smell at you. (Bring back Dreamfinder!) Ellen's Energy is
barely OK but makes me long for the original - remember that cool rotating screen elements? That made the interminably long movies a lot easier to sit through! Test Track is decent enough but the exit is by far the more shameless shilling of any sponsor of any part of WDW.
The Seas doesn't do much for me. The new ride is pretty neat, but the big aquarium somehow doesn't capture my imagination. But then, I've never see Turtle Talk, either, which I understand is pretty neat.
Mission Space might be what Mark meant by MtM? (Mission to Mars being the old MK attraction, of course.) The original was pretty grueling to me, and I found the "tame" version surprisingly lively still and more enjoyable for me. But then, I always have a tough time with simulators where you're watching a movie, like Star Tours, while my wife isn't bothered by them in the least but cannot handle Tower of Terror or the Splash Mt drop, which are some of my favorites.

We'll all different!