Well by what I've seen and I include myself in this.
I picked my dm up last week and went to a park / walk and feed ducks
It was really busy probably as busy as a summers day. There was loads of groups of 3 or 4 sat in the park area. Lots of runners and walkers. Friends /mums and daughters with kids etc. When I say lots we prob saw over 100 other groups /couples.
And I can honeslty say maybe 3 were SD
We even saw a kids birthday picnic with 5 adults and their kids (noticed as they sang happy birthday with a cake for the little boy)
The park area has open lake area. I chose to take my dm because my 2 yr old would be a nightmare by the water and I had the baby in pushchair.
And in all fairness. The path is fairly narrow with a cycle path adjacent. There is no way people in 2s could walk 2m apart without constantly bumping into people.
So I'm not judging. I just wondered if the same most places.