Growing up my mother would keep our butter in the butter tray in the fridge. We didn't use it often, and rarely had bread with meals like you do eating out. However, after getting married my wife grew up keeping the butter in a covered tray on the counter. At first I was like ewww, but honestly, it's a lot nicer to be able to spread soft room temperature butter on toast or even just have it right there to slap in the pan while making eggs without having to worry about cracking the glass butter dish because the butter was in the fridge and rock hard.
What say you... butter in or out of the fridge, and is this a regional phenomena?