Always. There's 2 of us (when DBF works nights it's just me) but I usually prep for 4-6 people so we have lunch for work and dinner later. I have 2 giant Tupperwares of buffalo chicken chilli that we've been taking for lunch.
It's just the two of us, so when we have things that are best prepared in large quantities, like lasagna or chili, we will freeze some immediately for future enjoyment. (Lasagna made in disposable loaf pans and frozen uncooked.)
In general, we try to cook enough for Beth to take some as lunch the next day, depending on what it is (she doesn't like sandwiches, I don't like leftovers).