We're really just losing the Big Thunder Ranch, which is a nice little diversion, but it's always been a temp place-holder. River's getting shortened a bit, but if the end result matches the concept art, I think it's a step up from seeing the parking garage from the Mark Twain.
As far as Star Tours, I personally think it's a wonderful ride. It was the first full-blown public flight-sim ride, so it also marks a big event in theme park design. I was there for the first summer, when the line went all the way down Main Street, and loved it even though I grew up with (the wonderful) Adventure Thru Inner Space. These days it makes me a bit motion-sick, but I still enjoy it.
I still think it's *weird* where they're putting Star Wars Land--And I'm sorry the horses have to commute farther to work now--but I have to admit I'm very intrigued by the scope of this project.