Well, I also figure into the price the express pass. For only roughly $40 more a night, every member of your family can skip the lines to almost every ride. I am paying my money to have fun on a vaction and waiting in line does not=fun to me. I would GLADLY spend a few dollars more to ride whatever ride I wanted, whenever I wanted, without having to wait more than 10 minutes to do so. That to me is fun...waiting 90 minutes to ride a 2 minute ride at Disney is not fun. Along with that, you get a much better transporation system to and from the parks, a MUCH nicer room, better places to eat, and very nice pools. Sure you could go "cheap" at Disney, but you get what you paid for. Cheap beds, long transportation to and from the parks, boring, crowded pools, and nasty quick service food. Thats why I was comapring Disney Deluxe to Universal hotels. Even if you got FD while at Disney and at a Deluxe hotel, you would still save money at Universal without the dining, becuase there is no way your family can eat $1500 worth of food in 7 days.
While you might have a better deal going now becuase of the FD being offered, most of the year, Universal is by far the better option for all the benefits you get plus the lower cost.
EDIT: I wanted to make it clear that I would never pay for the express passes becuase that is just silly unless you are traveling alone. Comparing Disney to Universal rooms, I would pay more for a room at Universal because of that perk, but I am typically spending less on the room when compared to a Deluxe and even a Mod. Sure, it should be considered a free perk, but it is one that I don' mind spending a few extra dollars a night on the room to get.