Personally I liked last years Scare Zones, especially Dark Apocalypse, I thought it was good because there was quite a few actors to quite a small space. When it was quieter it was better, I got chased with the chainsaw twice!
I think it also added to the night time atmosphere, making it feel like Scarefest!
However, if they do want to keep it fresh they may have to go back to the old format as there is only so many infected zombies you can stick around before people get bored! The idea only works for that area because of the area's theme.