One of the things I have noticed during my recent period of ‘letting the mind lie fallow’ is that when you don't feed it a steady diet of dharma, the mind kind of gradually relaxes. Topics to do with books disappear disconcertingly quickly, and the thoughts rearrange themselves into an easy state, a point where it is suited to the day to day, and even when you contemplate the thoughts that come up are not immediately Buddhist or even part of some other form of spirituality.
It makes me wonder how deep the Buddhism has gone, I have spent a good five years looking at it and at my mind and at my heart, I have soaked myself in it at times, and yet I find my mind always ready for something new. During the period of fallowness I have distracted myself at times with the audio lectures of Terence McKenna, who doesn’t have much truck with spirituality but has a wide ranging command of the English language, as a kind of neutral busy-ness. Perhaps in five years you can only acquire a thin veneer of Buddhism, easily scraped away by applying any new thing over the top.
Some things remain, such as the new attitude to letting go and not clinging, so It seems that those kind of lessons stay learnt, and perhaps even influence the process of finding ease in the mind.