As usual, I agree with HBC. Please try to bear in mind that the weather systems WDW saw last year were totally unprecedented in the history of the resort. I may be wrong, but I don't believe they EVER had a park closure due to weather before 2004--and last year there were two separate closures.
Regarding the
trip insurance, be sure to research carefully before you take that leap. Admittedly I've not looked into it myself, but I've read here that they only reimburse $5 per point (which is pretty low) and that there is a specific list of valid reasons for cancellation that would permit a claim to be filed.