So I know that my take is in the minority here, but we were there just a few weeks ago, and it didn't kill the vibe for us at all. When we go into EPCOT from the front entrance, we walk into WS either via the Odyssey or the Figment side walkways. We never go right down the middle. When we are walking around WS, we don't look across the lagoon at all, but simply look where we are going. When we leave, it is via the same walkways that we entered (well, the other side), so again, don't ever look directly at the middle. That's just us, and I know that most hate these things, but they just don't affect us at all.
Our big issue with it, is that it appears that the only place to see the best show will be directly in front of it, which was the FP and dessert party areas. I don't see how, if you are standing on the bridge between Britain and France that the view is going to work very well. That view worked just fine for ROE. Guess we'll have to see exactly what the views are like around the lagoon in the future.
And just so y'all know. I was at the opening of EPCOT back in 82, so know exactly what it looked like back then. Lots of dirt piles for years until all of the countries were built out. Again, I know that my view is in the minority, so flame away.