The handiest place to have one, IME, is not at home but at work: you can leave it on the pad for most of the workday but always pick it up right when you need it and not have to worry about fiddling with the cable. Especially when the phone gets a couple years old and you need midday charges for it to last through the day.

It's not a vital feature, but since decent chargers are only like $25, why not?