I would also add that this is a forum and a forum is typically the place that computer savvy owners go to help diagnose their problems. Trust me, I have owned dozens of cars and no matter what the price tag, they all have their own weak links. In the end, the CTS is an excellent car and when compared statistically with other makes, performs better than average. There isn't any reason why a well maintained CTS cannot see 200,000 miles or more.
So don't worry about little stuff. Maintain your vehicle, drive it like you stole it, and enjoy the ride!