I am sure other's will have plenty of opinions for you and it is different depending on how much walking you are used to etc.
We have only stayed there once so far and very much enjoyed it. We did not have a car. The bus service was fine and the walk to the Hospitality House, pool etc. was a little distance. It was fine with us but you wouldn't want to... "oh I forgot something, let me run back to the room". It did feel long at times. On one occasion it was pouring rain and that was not lovely.
I guess what I am saying is, we didn't have a car, had a fine time, but made an extra effort to remember everything we wanted when going to spend some time at the pool, or the restaurant etc.
Plus you may get lucky in that those with cars might request outer buildings to avoid the "hustle, bustle" of the H House area?
Enjoy!