If your talking about Stoney Creek (AKA the Buckhorn) in Shebly Twp., then i would have to say that its not. This is my home course and I play it all the time. While it is challenging and pretty long, its too open and has very minimal elevation. Basically if you can throw 350+ you shouldnt have too much trouble throwing close to par after a couple rounds. Still a great, and fun, course to play though. LOTS of shot variety.
Out of the dozen or so courses that I've played, Four Mound disc golf reserve in Spokane, WA is the hardest. Most of the holes are 350+, and the course is downright rugged. Fairways are tight and the rough often consists of tight groups of young pine trees that are extremely hard to play out of. It is the relatively unspoiled nature of this course that makes it so tough but so incredibly rewarding to play. Out of the three 18 hole courses, Cape Fear was the hardest and really lived up to it's name.
This course is a tight and wooded, with multiple fairways that require perfect placement shots as well as as few open longer holes. This course is a good mix and everything a disc golf course should be.
Toughest to date for me was Fly Boy Aviation's private 27 hole course in Georgia, only played it once before hard rains came but it felt like 50+ 'normal' holes. Lots of long holes (including an 1600'+ and several 900'+) and a bit of elevation changes.