The fireworks dessert party is normally offered but honestly, it's a waste of the Halloween party in my opinion. Other than that, they do not do anything else special.
To maximize the Halloween party, you want to be in the middle of it. Character meet & greets at these parties can be very long and the parade is a MUST DO. Fireworks as well but there is great viewing for these all over the park. Especially in Frontierland/Liberty square connection and near main street (the hub).