If technology makes us so efficient, why do we have so little free time?

Technology has changed the way we communicate and entertain ourselves. We don't have to plan every detail in advance because we have smart phones to call and look things up at the last minute. We don't even have to print directions or carry a map, we have portible navigators. Entertainment on the go is easy too. All your music can fit on a small hard drive that is portable and easy to use, leaving out the requirement to select music for the gym or travel. You don't even need to go to a video store to rent a movie, because it can be selected on-demand through cable or the Internet. With so many efficiencies, why do we have so little free time?