We have never used our front door, always the back door and I think it's more common to do so but looking at my neighbours, they all use the front door. Our driveway is to the side of the house so when unloading the car it's easier to go round the back as that's the kitchen side.
All who visit us, come to the back door too, there isn't even a door bell as it's a patio door so they just knock or see us through the glass.
Using the front door would feel abnormal now!