It depends on the agent. Disney's prices are all the same. No extra discounts. promo codes, or coupons for anyone. The difference when using an agent is Disney will give the agent 10% commission for booking the trip. Booking through an agent is no different than booking through D Travel Co. You still have complete control over your reservation.
So....a good agent, like myself
, will give a large portion of the commission, back to the client as an extra discount. A trip costing $2500, agent gets $250, but takes off $200 the price of the trip and still collects $50 for booking it. Win-Win. But sadly.....its hard to compete with the big agencies because not only can they do that, but they book a lot of rooms for the same weeks (days), they can get a group rate in there too. You will never know when you are traveling, but you are really in a group with Mary Jones and her family, and Fred Smith with his grandkids!
So....even though I am a small home based TA, I am all about getting the best deal possible, and I recommend going through a large online agent if you want the lowest price possible. If you want personalized attention and have lots of questions and need help with your reservations, book through a small agency.