My girls and I actually had that very discussion because I feel that way too. For me to go to a park to read I would have to drive there. But these people made the effort and seemed to be enjoying it. My daughters both live in large cities and would definitely go to a park to read or enjoy the outdoors. I think it depends on what's around you - park wise.
Yes, that's one of the many things I love about Paris. It really is a city of readers.
What a great collection of photos!
Thanks for the comment on the photos ... it was fun trying to not seem like a crazy stalker.