DK, the Harry Potter area of IoA was lots of fun, but extremely crowded. There were lines just to go in the shops. We waited for at least an hour and a half, possibly longer, to get into Forbidden Journey (though it wasn't so bad because the queue area for that ride sets a great atmosphere... as you make your way up in the line, you walk through Hogwarts and see the various classrooms, Dumbledore's office, the portrait gallery & its talking portraits, etc). I can only imagine what it's like on weekends if that's what a Tuesday looks like. If you want to go, I'd recommend waiting a few months until the attraction is a little less new and the crowds are hopefully a little smaller.