My freezers are chock full most of the time. DH and I had three kids in two years, and for a year when they were in their early twenties we also had two of their significant others living with us. (One of the most fun years of my life.) I just never got out of the habit of bulk shopping and cooking despite all five moving out 10+ years ago.
Cooking for two isn't much different from cooking for seven, especially when making a time-consuming recipe. For instance, last week I made some of my plant-based Italian meatballs. The effort to assemble and mix all ingredients to convert 1/2 lb of Beyond Beef to meatballs and cook them isn't significantly less than doing three pounds. Therefore I do a full Costco sleeve (three pounds) of BB "meat" at once, including cooking, cooling and freezing in ziplocks. With my old iPod hooked up to Oontz speakers in my kitchen, I happily dance my way through cooking and baking.
Thus the full freezers.