Last summer was crazily amazing in this regard. Absolutely EVERYBODY played, and wherever you walked outdoors, there would be people with their phones, calling out when they had beaten a gym or found a rare pokémon. If you had trouble with anything, you could call out and find somebody from your team to help you, or just have kind strangers explain things in the game to you.
And the lure lands haha. We had some spots, a specific one near the river, with three pokestops so close to each other and a lawn in between, so people put lures up and just camped there, chilling out with food and bringing blankets or chairs and just generally hung out. Every day in the summer, for weeks, it was always full there after the workday had ended.
Pokémon GO was a phenomenon, but in my cold country it was bound to end as the days grew colder, regardless of actual popularity.