The four close does dump most of the visitors out into peak traffic on the way home though.I'd like the park to be open longer but I can see why they don't bother is what I'm saying. On the weekdays queues have been 5-25 mins normally and most rides take no more than 15 so I think you could easily get everything you want done
Half five closure would mean much better roads for the non locals on their way home.
Later opening would be much better for those not lucky enough to be bloody locals mate!