I disagree, Hal. The microwave is perfect for softening butter taken straight from the fridge - 5 secs on full power, turn, then another 5 secs = perfectly spreadable. It's also quite good at releasing flavour from mushrooms - if you don't have time to air dry them, slice and nuke on full power with a knob of butter for 45 seconds. To a lesser extent they are handy for reheating dinners - if I'm going to the pub I often make an extra plate for supper and nuke it when I come home full, generally a healthier alternative to buying half the contents of the chipper or Chinese.