My mom works at a library that is a gym, doesn't get anywhere near this amount of traffic. Makes sense, and the location isn't big enough to hold that many people on its lawn anyway, but still, kind of interesting to see the difference.
One of her coworkers is trying to make something close by a pokestop. I sent my mom this post and she enjoyed reading it, and it opened her eyes to problems that might happen if they do get a pokestop nearby.
Yeah, similar story here. There's a gym where I work, but it's in a restricted area (where papers/magazines get printed). People were actually coming to the back gate and sticking their phones in, because they could barely reach the gym that way. Security guys definitely have more work now.
In Belgium there's also the story of Lillo, a very small town of like 40 people that now gets overrun every day by pokémon trainers. Restaurants/bars get an incredible boost, but townspeople are getting fed up. People are leaving their trash everywhere and they have to clean it up in the morning.
I've seen people list up their catch... the stampede is sort of justifed: there are crazy amounts of rare/strong Pokémon spawning there.