A disadvantage of living in a world with e-mail is that when I am expecting something to arrive in the regular mail, I have an impulse to go check our mailbox every ten minutes, even if the mail has already come for the day.
And a disadvantage of living in a world with cell phones is that whenever I misplace something - anything - I have the urge to call it so I can figure out where it is. Sadly, my wallet, keys and sunglasses did not come with telephone numbers. They should. (Fortunately for me, when I lose those things, I usually lose them in the same places every time, and my husband knows where those places are.)