I am truly appalled at the lack of grilled cheese knowledge in this thread. You people should be aSHAMED.
No sandwich of mine will EVER be in a microwave!
Butter the bread, put it in the skillet, put two slices of cheese on the bread, place the other slice of bread on top, flip maybe two-three times, voila - you're done. And it maybe takes 10 seconds more than the microwaved crap you heathens eat.