They do not get you better deals than you can get yourself. Go to the
www.disneyworld.com website and hover over Tickets & Packages then click on Special offers. That is where all of the discounted packages will be.
As for your earlier post regarding arriving on Thanksgiving day then getting another reservation two days later with free dining....that can be done. You can pick up your park tickets 3 days in advance so can go to the parks those first two days as well.
Check out travelocity and expedia. They were giving crazy discounts on room only. I think it was actually a misprint but they honored it.
Free dining is not always the best as it's really not "free" as you are paying rack rate for your room.
As for airfare, I use the discounted airlines such as Southwest, Jet Blue, and Air Tran. I have never flown the "major" carriers as they can't be the others even with the added baggage/seat fees of Air Tran.
No, it is not too early to book.