Does disney read these boards, and others like it? I think so, if only because it is free research and they would be stupid not to.
Do I think that the discussions that happen here significantly impact decisions at Disney, or anywhere near that of research and comments from the general guest population? Most certainly not.
I see that, however unfortunate it may be, that the views and opinions of those that post here are seen by Disney as a small subset or niche of those held by the average guest, and while they may read what is posted here, they don't act on it because of this.
In some ways I see where they are coming from, I mean, they run the parks in an effort to please the most people that walk in the door, and I don't think on the whole that we here share the same opinions and priorities as the majority of the guests.
I think we all here have what is best for the parks overall in mind, because we are a much more informed audience. I think the average guest is only concerned with their own personal experience. Unfortunately, Disney is more inclined to listen to the latter.