The annoying part is that this becomes increasingly difficult to impossible. For example, I can't use public transport without my phone anymore, because my ticket is bound to my phone and the provider does not issue paper tickets or smartcards anymore.
Less severe but equally frustrating, many restaurants choose to use QR codes for menus rather than printing them onto a sheet of paper or writing them to the wall.
I love leaving my phone behind, primarily because I am in the "we're entertaining ourselves to death" crowd considering I essentially grew up with mobile phones already. But our environment is increasingly build on the assumption that we carry a smartphone with us at any given time.