My experience was way different than the OP, I arrived around 3 pm on Friday, waltzed right in, the place was in full swing, lots of people chatting and getting to play a wide range of games, everyone was great about taking turns playing. The longest line was at Wonka (which I my wallet asked me not to play).
Only disappointment was I missed out on the Cow shirt!
If the promoters reads the posts, they will hopefully implement the pre-sale and multiple cashier suggestions.