Just went yesterday... I would try to go in the morning before it gets too busy in the afternoon. Maybe it will be a little less foot traffic if you're going on a weekday.
The Amish doughnut from Peachey's Baking Company really is that good. The line is always long but worth the wait.
As far as other new foods we tried... The Longanisa Cheese Curd Lumpia was really good. So were the elote tots. I heard really good things about the Hmong corndog from Union Hmong Kitchen, but I got a pronto pup instead for nostalgia.
If you want to see the crop art, you are going to be waiting in line for an hour or more. I'd say your first priority when you get to the fair is either get in line for the doughnut, crop art, or the apple fries. The line for the apple fries was so long at 10 AM we didn't even bother.