We do save for our vacations. We have a "Disney Account" and deposit money into it constantly. We use DH's bonus money, tax refunds, and set aside a $$$ amount each month for deposit. We budget the monthly contribution just as if it were an actual bill to pay.
I also have a "mad money" cookie jar that I holds any money left over in my wallet at week's end. Before I spend money on, for example, a fast food meal for the kids--I think about the money I could be putting away in my duck if I went home and made them something instead. Sometimes I give in to the convenience of an on the run grab & growl, but most times greed wins out!
Tip money is put aside as we have it, i.e., when DH or I have four $1 bills we put it into a Mousekeeping envelope for use on our vacation. Ditto the limo driver's tip, bell services, etc.
I purchase airline tickets about 10-11 months out and so they are paid for long before vacation. I also pre-purchase UMPs or APs in advance so that is also covered before we arrive. Basically, my goal is to have all paid but for the hotel/food/souvenirs prior to arrival.
I work hard to get discounts (although the cost is still very high) and we do lunch meals at sit downs with very little "snacking" at counter services in the park. We utilize the concierge lounge to our benefit by eating breakfast in each day and many evening meals, too. We've not been quite as good about using the lounge for evening service in the past, but it's in our plan to do so a good deal this year. We'll see how it goes.
All of that said, we don't scrimp on the vacation and pretty much do whatever we feel like doing without worrying about the money end. We do not use our charge cards (except to pay for the hotel) and ALWAYS pay those bills when they are due rather than carrying a balance.
The kids have known from a young age that they will not get a ton of stuff while at Disney. They get one reasonably priced souvenir that's purchased on our last day. They have never been the type of kids to ask for ice cream, popcorn, or other goodies in the parks. They have also known that begging for things will not be rewarded with the sought after item. Those $5/$10 purchases add up big time. By the same token, when it comes to mealtime they aren't denied the foods of choice as long as they eat what is ordered--including those pricey desserts.
I guess the bottom line is we are pretty disciplined in our money management strategies. We enjoy our money, but we know when to say no.
I hope you can fulfill your dream to stay at Polynesian--it's certainly our favorite! WELCOME TO THE DIS! If you need help or ideas--everyone here is willing to give advice!