I rode it today, and tweeted about it, but in a bit more detail:
Bad: the screen is too small for this, and the edges are very noticable without the 3D glasses. You are also way, way more aware of other vehicles moving around you.
Good: the visual quality of the film is way, way better. Very clear and sharp. And it's just nice not to have to wear glasses.
So to me, it's a bit of a wash. But really, I don't really miss the 3D. And I agree that it must cut back on staffing and resources, so that's gotta be a plus. But a larger, wrap around screen would be better... but I don't really see that happening.
To be honest, I didn't notice anything about a different voice for the pre-show, but I wasn't paying attention to that, either.