An honest answer, because it is the question most people are really asking. If being able to walk back to your room mid-afternoon matters more than anything else, stay in Pokolbin — there is accommodation within minutes of the entrance, including on the estate. You will pay resort rates for it, and you will still drive to reach a supermarket, a chemist or a choice of more than a few restaurants.
Cessnock is the other trade. You are 11 km out, which is one short drive at each end of the day, and in exchange the town centre is on the doorstep — restaurants, cafés, a chemist and a supermarket all within a walk of the inn. For most guests visiting the Gardens for a day, that is the better shape of trip. For guests here three or four nights, it is not close.