When we bought our first contract in 1997, we financed it through Disney, took a 10 year loan. Our logic was that the 10 year loan had the lowest monthly payment. We always tried to pay more than the minimum monthly payemnt, but in those months when were a little "short", all we HAD to come up with was the low payment. Of course, interest rates at the time were pretty comparable to other loans.
Some people use a home equity line of credit, part of which can be written off your taxes, I think. Others get a personal loan through their bank, because often the interest is less than through Disney. We know one couple who used their Disney VISA to purchase to get the dollars on there, but had the cash available to pay it off the next month. Thye are both very well-paid attorneys! The average person probably can't do that.
If I were to purchase now, I would probably put it on my Disney VISA to get the points, and then use my home equity line of credit to pay the VISA bill when it came, and then pay off the home equity line. That way oyu get the points on the VISA card, and the benefit of being able to write off some of the home equity interest.