At least the fireworks will be shown, and that show is pretty awesome! As much as the refurbishments and closures suck, they are necessary... We were there last February too, and it was a first trip for the family we went with. Even though Critter Country, Peter Pan, Grizzly Peak area and WOC were being refurbished and they never got to see the castle they were so impressed, we couldn't get to everything in a 4 day trip, and they immediately wanted to plan another vacation to see the stuff we missed! So I don't think it will make or break your trip!

WOC is an awesome show, and I like the 60th Anniversary version a lot, but I could miss it in favor of the fireworks show! Have fun planning!