Wow, odd to hear that you needed the two days. It was absolutely dead when I went
We didn't need two days, our second day was our original plan but I didn't like the idea of leaving the park till the end of our trip in case of spite. So we booked up the earlier day and went back for re-rides and fireworks. It was pretty quiet when we were there too, although I feel the mixed weather put a lot of people off.