We visited on the Saturday during the Mid-Autumn festival--a "special day" with higher pricing--and were stunned at the sheer emptiness of the park. Compared to the Disney parks in Orlando and Anaheim, where long queues are the rule even during typical weekdays, there were essentially no lines for any attractions.

I would also echo what others have said about the size of HK Disneyland compared to other parks: the entire park can be navigated in less than half an hour. And you may not want to visit if you're a fan of rides (even the relatively mild Disney variety)... besides Space Mountain, there really aren't any attractions that really manage any speed. In-park concessions, though, are reasonably priced--for Disney standards.

All in all, I think worth a half-day visit.