If you're being physically active you might not notice the vibrations, it also makes it easier to find when you're aloof and set it somewhere random. If you're dressed in multiple layers you wouldn't notice it, also might not have pockets.
I feel the same. I can tune out a sound if I have to, but that vibrating in my pocket feels like a little robot is physically insisting that I pay attention to it.
On call schedules, in your gym bag. I imagine the vast majority of them are less attached to their phones and develop habits of leaving it in the other room for a while.