Now that engines are regularly outlasting the rest of the car, and therefore having very little piston wear, how much bedding in (piston wise) can be done in 1000 miles?
The other half got a new car last autumn and it did take about 800-1000 miles for the brakes to not feel wooden, so I think there is an argument for taking it easy for the sake of the other consumables. If you took an old car and had new disks, pads, tyres, clutch and suspension, you'd probably think it wise to take it easy for a few hundred miles...