I don't think it will.I think paying for parking is going to sour it a little but if you're able to get a full 12 hours in the park and if it's a family of 4, the parking becomes less of an issue.
For the park being open so late, the Express Pass is just an added bonus if needed.
Aquatica, Discovery Cove and Adventure Island (BGT's water park) all charge for parking. Most tourists won't even know that Disney doesn't charge for their water park lots anyway. Also a lot of the guests will be staying on-site.