We've been going there for years (we live about an hour away), and I realized last night that we go there as much for the food as we do for the great rides and the super relaxed atmosphere.
Traveling Tacos: a one serving sized bag of crushed Fritos with taco ingredients shovelled on top and served with a spoon; great! Excellent pulled pork bbq sandwiches, chili cheese dogs, fries, pizza, soft or hard ice cream (Leichtman's), pierogies, potato pancakes, fried chicken, and on and on. The only flat spot is the burgers, which are the standard frozen patty found everywhere.
Knoebel's has no admission charge, you pay by the ride; so if you want to go there and walk around, channel the park's energy and atmosphere, watch the shows featuring local talent (good wedding/high school level, generally), and maybe move your teeth a bit, then it won't cost you more than $1.50 for the funnel cake. And Knoebel's is not a sea of asphalt with rides plunked down on it; it's dirt, gravel, trees, streams, and ponds. It's a nice place.
I'll save you the seat next to me at the Derby Race.