I just bought into the DVC since I plan on making many trips in the future. If you want more info on DVC I highly recommend posting your question on the DVC board.
There are a few ways to make travelling to WDW more affordable:
1) Travel from the US when possible - I can get airfares for as low as $300 CAD, including taxes, out of Seattle.
2) Annual Passes - I find one of the most expensive aspects of travelling to WDW is the passes. Annual passes allow you to spread the cost out. It is great making a return trip knowing you do not need to buy another pass.
3) Discounts - Check out
www.mousesavers.com . They list all current discounts available. One of the best sources for hotel discounts is an annual pass.
4) Stay at moderates - Not as inexpensive as value resorts, but they have a resort feel without paying deluxe prices.
5) DVC - Although the upfront costs are quite substantial, it does pay in the long run.
6) Do smaller trips - Instead of going once a year for 2 weeks, do two or three smaller trips.
Those are just a few things that can help reduce costs. Hope they help.