I use mine almost daily. I make a lot of OAMC breakfasts to freeze and then reheat them, mostly egg muffins. I also buy meat in bulk and freeze it, so I use it to thaw the meat out before I cook it. Also melting coconut oil or cheese. Aaaaaand bacon. A lot of bacon.
The newer microwave we have at home is so much better than the old microwave at work. It does a much better job of reheating something to warm and not actually "cooking" it further. The old microwave is crappy and tends to jump right from "haha, you thought it wasn't frozen anymore, didn't you?" to "LOL now it's totally overdone." Having a NICE microwave has totally changed my perspective on using the microwave to reheat something.
I would miss it if I didn't have it, but since I'm only feeding me, that changes how I cook and use food. Also being poor changes how I interact with meat, haha. The biggest time I would miss it is in the mornings really, but that's because I am the opposite of a morning person and a few extra minutes of sleep is A Big Deal to me. =P