Here in Eastern Ontario I don’t know anybody who plows their paddocks… and we get a significant amount of snow.
My guys are out 24/7 unless it is VERY nasty.
The horses will get around just fine in deep snow and they will keep it tromped down. Even my neighbours two 11hh ponies manage just fine in the deep snow.
Yes… your fences will ‘shrink’… electric will help.
We have electric running along the top of our split rail fences.
We keep lanes cleared with the tractor blower down to the barn and hay loft.
Using the blower ensures no large piles of plowed snow… it mostly gets blown far away, although there are some spots were we have had to use the bucket to push some of the snow away.
The gates themselves are shovelled out ‘by hand’