Well we use to too, but very long ago, actually i dont know why but in the forest south of my birth town Aarhus there are the remnants of old stone walls here and there, but absolutely no system at all to where they are.
Also by now and so many leaves falling and getting blown up against them to compost there, mush of them are more like a little berm with stones on the top.
In the way way old days the little fields attended by the owners slaves ( Danes ) they might have been split up into little parcels too.
Also the British living fences ( hedges ), are not really used over here aside for maybe a handful of die hard enthusiasts.
Some places you will find grows of trees planted as wind breakers, not least out in the western and northern part of Jutland where wind + sand have been a issue for decades.
My friends house are build by such field stones too, and what ever they have put in to not use as much cement, you need strong stuff to put a screw in his house or make a larger hole.'
Also used for decorative walls around many a old church here.
No nice cut sandstone for the poor farmers of Denmark,,,, o hell no.