We went to HersheyPark in the first week of July and thought it was quite empty.
Nevertheless, hentob, Storm Runner is absolutely awesome. Not the best roller coaster I've ever been on (that honor would go to the loopless, but amazingly smooth and exciting Apollo's Chariot at Busch Gardens Williamsburg), but it was good enough for us to go on it 3 times the day we were there. It does have the absolute best loop sequence. It's amazing. You're upside-down for what seems like forever.
RyMickey