Honestly 95% of the time I'm cooking just for my partner and I, and I have relatively few issues with using any of my cookbooks/recipes just for us. Sometimes I simply half the recipe (while adjusting for cooking oils as necessary.) I also am happy to have leftovers on hand for lunches during the week, or to freeze extra servings for when I'm away so my sweetie has something homemade to eat.
If I'm buying something like a large roast or pork loin, I'll also try to cut it into smaller sections before freezing so I'm not cooking like a huge 6-8 pound roast that'll take us days to eat.