When are you planning on going and what resort level are you planning on staying in?
Essentially, those two things are the main factor.
First, you can get a CAA membership which will enable you to get 10% to 20% off the room rate - depending on the resort level and vacation season (value season gets better discounts than regular season for example).
Also, make good use of mousesavers.com - during most seasons, except Holiday, and sometimes Peak - there is some sort of promotion by Disney. Currently, there is an offer that can be booked where upon purchasing a package with Base Tickets, they will be upgraded to Hoppers Water Parks and more tickets - if you had planned on this ticket level and are going within the next couple of months (the eligibility window for this offer) - you can save about $100 per person.
Really, as long as you DON'T go during Holiday or Peak season and plan in advance, you shouldn't ever have to pay full price.