I've had 14-15 new cars, run them all in using exactly the same technique and never had even the smallest issue.
Once it's warm you can do what you like with it. Obviously don't rev it to the red line in every gear all day long and don't practice your Santa Pod launch technique but really once it's warm it'll be fine.
I've had a few cars too and have never been gently gently on the run in. Never had one break and all have performed very well. Engine tolerances are so much better nowadays - couldn't have done it with an old Ford Kent engine for instance!