I WISH I had a big enough freezer to do that! If we ever move into a house with an attached garage, I definitely will get an extra freezer!
Right now, I feed my freezer:
leftovers if I make a big batch of chili or soup
frozen fruit (I've been slowly buying, chopping, freezing and bagging all summer)
Occasionally I do pizza dough, gravy, casseroles, muffins. And when I HAD a garden (I let it die this year - too hectic w/ FT work and...