In the old days engines needed to be run in carefully due to inferior manufacturing. This is when constant speed was not advised as engines wear least when they run at constant revs, without labouring the engine, so it would prolong the running in period.
These days engines are made to better tolerances, and are run on an electric motor at the factory to bed in the components.
Brakes and tyres need about 100 miles of careful use, brakes to allow the pads to wear to the shape of the discs and tyres to get rid of mould release and scrub the shiny surface off. SO you should be safe to use your brakes and tyres more now.
I did the same as you, gentle acceleration, don't let the engine labour and keep the revs within about 8000. I kept this up until 1st service and then increased revs and acceleration for another 400 miles. After that I was off to Scotland so I used the engine fully

I couldn't bare to restrict myself on those fabulous roads

Some say that using the engine fully straight away will give get the maximum power out of the engine, I doubt it will be much more than a few BHP, and I would be concerned about how long the engine would last with this treatment.
I would always follow Honda's guidance and do as you are doing.
