I live in a fruit growing region as well. When a mature orchard is taken out, usually the large wood is chainsawed up and sold by the cord as
firewood. The small stuff, what I call 'slash' is just impossible to safely cut up in an economical way. When I first started working my
apple orchard, I cut up every last little twig for firewood. It burns great, but it is really pretty dangerous to cut up in large quantities. As I get older and value my physical wellbeing, I too now cut up the large stuff (larger than 2" in diameter), and then burn the rest. The burn pile areas revegetate quickly, and the surrounding pasture seems to benefit from the fertilizer value of the
wood ash. Compromise.
To your point, if you dont want to burn the slash, this stuff would be good in a hugel bed. Save the large wood for heating or barbequing, and use the smaller twiggy stuff in the hugel bed. Fruitwood is very dense, so even the small branches would take a while to break down. Additionally, the small stuff with lots of bark and buds has the majority of the nutrients. Being younger, it also would have had less exposure over time to the chemical sprays.
As far as buying property surrounded by commercial fruit orchards, you might want to think seriously about the amount of chemical spraying that will occur. There is a lot of over-drift from ineffecient spraying, and it is really nasty stuff. Your commercial farming neighbors will likely not be too sympathetic to your more organic sensibilities. Pros and cons for sure.