Horizons has been closed 15 years now so lets say it was still open and operating, what would be the general opinion of the ride today?
I would have to believe we would have a lot of people complaining about Disney never updating attractions and always having to ride the same stale attractions.
To make this clear, I share the same sentiment and love for the original attractions like Horizon's, SSE and WOM and wish they were all still here.
While I get your point, I'd disagree. Horizons was two things.
1) It was the single attraction in Futureworld that bound all of the various themes (with the possible exception of Wonders of Life) together.
So, for example, you'd remember the underwater scenes from the ride when you visited the Seas. You'd remember the orange grove scenes when you visited the Land. All of the energy needed to run all of these things were explained in the Energy Pavilion. The future of transportation was shown in Horizons, and you'd think about it when on World of Motion.
And what did all of this potential "future" (that still looks like a pretty darned good one to me!) require to create?
Communication (Spaceship Earth), technology and computers (Communicores) and Imagination.
As a side note, it was this overarching grand experience that bound Futureworld together. Starting with Wonders of Life, it began to fall apart, and with the removal of Horizons it was completely broken. The "story" was gone.
2) The ride was a classic. Aside from American Adventure, it was the epitome of what Disney could do with animetronics and scene design at the time, and they have never reached that level of detail and epic scale since. When you rode it (like Pirates) you didn't feel like you were riding a ride or watching a show...you felt like you were PART of the show, even though there was a narrator.
How many children peered out at those scenes and thought "Wow, I really can't wait to grow up." How many parents watched the presentation and though "This is a future I wouldn't mind seeing my children live in."
The ride changed people. In a very deep way. How many scientists, engineers, programmers, technicians, designers, etc people (I know I'm one) can point to riding Horizons and think...I want to help make that happen someday.
After experiencing Futureworld, where we are going, then you make it back to the World Pavilion, where you can sample and experience all of the cultural glory of Spaceship Earth. EPCOT told a story. And that's why it was so amazing. Now, the story has been broken.
And THAT is why it was a shame it was removed. At least in my opinion.
http://passport2dreams.blogspot.com/2012/10/an-epcot-generation-manifesto.html
Also, I highly recommend the above blog post to anyone who remembers EPCOT Center. I think the author hit the nail on the head about what Futureworld at EPCOT Center was, the purpose it served and the story it tells (culminating with Horizons tying it all together), and hopefully will be again some day.