I guess it's down to personal experience but I've never gotten much out of "going to the water cooler / coffee" breaks. There was something magical about the smoke break where you had to go outside and talk for a few minutes. I've never been a smoker but I usually joined people on those breaks. You can do the same with a short walk and talk, but those aren't something you do every hour or two.

> Interestingly, in my experience, a "quick call" has been something where the other person doesn't want an email to get forwarded. That's why they don't include the subject in the message/meeting invite.

I think there is certainly some of this.