Sure, it's something the Swedes figured out a long time ago, but carrying around a baby, arms-free, is a fresh delight for all new parents. It's like seeing the sun rise for the first time.
We took our baby carrier for a test run in a controlled environment (aka the living room and the kitchen) before venturing outside. Things you can do with a baby on your chest:

Um, wave to your wife as she takes a picture. (Hey, you've gotta start somewhere.)

Let daddy have a refreshing beverage from
his bottle.

Have the little one fall asleep without your arms falling asleep.

Get in some pre-baby-type recreation--all without exposing her to the video violence taking place on the TV.