Synthetic oils and run in at the factory have reduced the need in most new cars. That said, many brands still suggest a 1000km/600 mile break in just to be safe. Check your owners manual for any break in procedures depending on your engine type.
Yes, the owner's manual says not to use the cruise control, and keep varying the speed for the first 800 miles. I just did a lot of City driving for the first 800 miles. By then everything should be happy.