If I make pastry, not very often, I will make extra and freeze it if there is any left over. If I make pasty pie for Xmas, I will make 2/3 and freeze. The same with fish pies, I make 3 at at time and freeze two.
I buy diced beef instead of minced beef, cheaper, and mince it myself. Batch cook spaghetti and chilli, generally just one extra of those.
If I make sausage rolls for Xmas, I freeze a load of those, too.
Basically anything I make, I make double of. The same as others, I can eat from the freezer when too busy to cook, or too lazy. I have never had anything go off or taste badly.