Ardra, I actually do at least half the cooking in our 6 month MH journeys each year. I find that cooking for only two people is not all that difficult with only a micro/convection oven. I guess maybe we don't have quite as fancy meals as some do. Generally if we're having a casserole it would be a single dish meal or maybe we'd cook some vegetable which can easily be done on the stove top.
Yes I do understand that when I cook a roast in the "only" oven, I can't bake the biscuits at the same time. I have to let the roast sit for 12 minutes while the biscuits cook. But then people got by for literally thousands of years without two ovens, much less a microwave to cook it faster.
How did Mom ever cook for us three boys and Dad with only one oven? Wish I could ask her......

Ken