I don't come across them in writing anymore, unless it's poetry.
You don't see them that often, but they are still used occasionally.
From an article published 13 hours ago in Herald and Review:
But no matter whence it came, Sierra's first love has led her to unexpected heights, even before she heads to Lake Land College this month to study animal science.
From an article title this month, in Metro :
"Granit Xhaka pranked by Arsenal players whilst sleeping on team coach" --