We don't use the microwave very often while camping. On the other hand, I used it daily when I was living out of the B190 for a couple weeks between houses (which isn't surprising - I use the microwave at home every morning to heat up my oatmeal).
Our new camper doesn't have an oven built in, but we NEED an oven (Erica loves baking), so we bought a countertop electric convection oven. The only downside is that it won't be usable if we don't have electric hookups, but that's rare enough that we should be okay. We do like the three or four extra drawers not having the built-in oven gives us...
1995 Airstream Classic 30' Excella 1000
2014 Ram 2500 Crew Cab with Cummins 6.7L Diesel
Sold but not forgotten: 1991 Airstream B190
Sold: 2006 F-250 6.0L Powerstroke Supercab