The only digging I do is to excavate the runner bean trench every year to add organic material, and when planting (and harvesting) potatoes. No raised beds here, so I sometimes have to fork over an area I need for growing which got trampled on the previous year.
Absolutely nothing to be gained by routinely turning over sandy soil like mine - it's the same all the way down!
Not many farmyards here in Sheffield
so no ready and plentiful source of manure, just limited supplies of home made compost which is targeted at the growing areas which need it most.
I believe I'm in the 'Dig as little as you can possibly get away with' camp!