Personally, I would go ahead and pack. We're going about the same time and I've been mostly packed since February.
I packed even earlier last time... We live in NY as well, so I know the kids won't need all those summer clothes. I pack each of their suitcases with their outfits in ziplock bags (LOVE this method!), make sure each person has pjs, bathing suits, jeans/pants, a hoodie, and clothes set out to travel in. Two weeks ago I went through my packing list and packed all the other things we need for the drive and the resort.
My husband thought I was crazy last year, but it was so nice to just have everything set to go and put it in the car the day before we leave. We bring a ton of stuff, but we're driving and have the room and I like to be prepared even if we don't need it. I even made a list last time of what to do before we left the house (unplug, turn down water heater, etc)...
Have you made a schedule of the park hours for your dates? I made a schedule with the hours, EMHs, etc for each day of our trip, so we can decide which days/times we want to go to certain parks. A few things we plan in advance (we must do all morning EMHs at MK for example), but the rest we bring the schedule with us to look at in the hotel and make our plans for the day.
I also made index cards with the menus for the counter service places in each park. They're nice to have on hand because if someone's in the mood for pizza, a salad, etc you can look at the cards and decide where you want to eat.
Let me know if any of my files would help.
