My best tip would be to remember why you came to WDW in the first place. Because I live in Orlando, when I want to go to the parks, I just drive, go and come home. I don't eat in the parks (besides a cheep lunch), I don't buy little trinkets with big pricetags, and I use the water fountains. When I want to get away for the weekend, I love going to one of the deluxe resorts. I pay alot for the room, but I generally don't go to the parks at all (Thats right...Disney World with no theme parks). I use the pools and the ambiance and it's like a vacation w/o the drive.
For most of you however, you come as part of a big vacation, and your biggest reason for coming is the theme parks. So avoid the expensive restuarants, the expensive hotels and the souviners that you don't really need, and then you can spend your money on those 200 day, non-expiring, park-hopping, super tickets, with water fun, and all the other bells and whistles.
Alternate Answer: Spend the money...it's Disney and you only live once!!