It is funny that you ask, I was really worried about behaving during my break in period, so as soon as I hit 3,000 miles I was at the dealer asking for an oil change and check up. The service guy looked at me a little funny and said something along the lines of, "Son, we don't service these until they have hit 6,000 miles because they have platinum plugs, synthetic oil, etc." My CTS is my baby, so I insisted that they should change the oil and make sure everything was to spec. He looked at me like I was a little crazy, and maybe I am, but this is my precious we are talking about. Anyway, they had me in and out with an oil change and check up in less than an hour, way better service than I had ever gotten used to with my other cars, and I went back to being happy.
The moral of the story? The impression I got from the service guy I talked to is that the new designs are well put together, run smoother, better, and nicer than cars five years younger so a lot of the paranoia about getting through the break in period is a thing of the past.
That being said, I dropped the coin to get my car serviced at 3,000 miles just because I am taking no chances. But according to my Cadillac dealer, I am throwing my money away. They were perfectly happy to accept it mind you, but they thought I was being pretty silly.
Some people just do not understand the relationship of a new car to a person!