I agree with the PP.
If you're doing a long stay, then honestly you're going to have plenty of time in the parks. Sure, you'll miss out on the free hot choc and cookies, some Mr Bubbles "snow" and the parade/fireworks.
The first time around we loved the event, but as Duncan got older, we found he would not nap and was exhausted and asleep before the special fireworks. So, we just ended up heading back to the resort. Yep, wasted money in the DH's opinion.
For us, this year it will be money better spent elsewhere (say Mickey Gummies, seriously Duncan is addicted).