Right, the real test is knowing your device is tucked in the pocket and completely ignoring it. At first it might be hard, but completely doable. Before I start my drive I put my non-peered-to-vehicle phone in my pocket, and it ceases to exist while I drive. Similarly it can be done in any other situation; in this case, a coffee shop.

There is no need to leave it behind, just having the right usage control over it would suffice.