I think this is a great addition - I know people seem to always want "more thrills, more thrills" but to me - MK especially is about family's being able to ride things together. This is a perfect update of Snow White. While I'm sure some will miss the current dark ride, I always thought that one was one of Disney World's earliest failures - a ride that is too scary for many in its target audience, and too boring to those who are older. I gladly give up that for this. (Though I would argue against either this or VotLM being "E" tickets, more like "D" - though you can bet the lines will be HUGE early on - which will draw people away from many of the other attractions.
(Does anyone remember the first few years when Pooh came on-line and the lines for it were massive?)