OP, if those hours aren't enough for you, you can expand them several ways.
You can buy EMM tickets at the bargain price of $69 per person plus tax and park admission. EMM (Early Morning Magic or Even More Money as I call it) also includes a breakfast buffet. Not only do you get to be inside the park ahead of the general public, you can ride 3 attractions as many times as you want during the hour and 15 minutes of EMM.
Not enough time? Consider attending Mickey's Not So Scary Halloween Party. You are allowed in at 4:00 without having to purchase an additional ticket. I don't know the exact price, but I'm going to guess around $100 per person.
Still not enough? Well, maybe you need to maximize the time you do get inside the park with a dessert party. Why stand around for who knows how many minutes to get a perfect view of Happily Ever After?
Just pay $50 or $70 (the extra $20 gets you a seat), and you'll have your cake and eat it too while watching the fireworks. But these prices do not include tax or admission to the MK.
Happy planning.