Congratulations on the new camera. FF really changes the way lenses interact with the camera. Four thousand clicks or so is nothing--that's almost showroom new! I hope you enjoy every minute of using the new camera. Speaking of lenses...for example, on FF, the 50mm and 85mm primes become very "useable" indoors, and in normal social situations, like at backyard BBQ's and parties, weddings, and so on. For example, at 20 feet, an 85mm lens on a FF body has an 8.5 foot field of view, which allows for a two-person, full-length portrait, with a bit of space around the people to allow for some head room and foot room. On a 1.6x body with the same 85mm lens, you need to be 34 feet distant. And, because of the distance, the background DOF is more intrusive. If you want to show a larger area at an event, on 1.6x, the 85mm forces you to be 50,60,70,80 feet away, and intervening people become a major hassle.
All the old, traditional prime lengths, like 24,28,35,50,85,100,135 work splendidly on a FF camera, at the normal and accustomed distances which were used in shaping the way "35mm" photography developed over the decades. Small camera, eye-level, rapid handling, fast focusing, allowing close-in work with wides, normal distance work with "normals", and distant work with light, portable telephoto lenses.