We used Josephine from Small World (WDWVacations.com) last year and this year. Great service and a nice helpful person to deal with. Saved us $800.00 last this, not as much this year with little discounts available. Made all our dining reservations for us. Even went out of her way last year to help us when she was "stuck" with her family in WDW and we could not get there as scheduled due to the first hurricane.
We will definitely be using them in the future. Even if you were able to get the exact same rates from Disney, using Small World will save you a TON of time not having to be on the phone (or on hold) with Disney!
It's much easier to let the Disney "specialists" take care of you and look for discounts. Can't beat it since it's free!