Personally I would tell you that you should expect some waiting times.. We've been to Pop 4 times, most recently coming back Saturday and I think its more crowded every time we go.. The buses were my main complaint.. One night coming back from MK we waited in line 35 minutes which isnt bad in itself but to paint a picture of how many people were in line.. they were bringing 3 buses at a time every 5-7 minutes Id say and they were packing them like sardines.. and it still took 35 minutes to get to the front.. and we were supposed to be going when things were supposed to be slow..
If you know what to expect things dont get as irritating.. just go thinking there will be some wait times and if there isnt, than all the better for you..