We use ours for cooking baked potatoes before baking.
Ms d00d warms milk for coffee.
We sometimes have something from the freezer that takes all day to defrost. We keep it in the MW - switched off - just seem a good cupboard to keep it.
Heating water for tea, heating soups, melting butter for recipes, heating doughnuts, or pastries to make them soft again, frozen veggies in the bag made for microwaving, Hotpockets, and much more.
I was gifted one as a ‘house warming’ present when I moved in here - but I didn’t like anything that came out of it. It was used for storage for a while - then I put it out for the rag and bone man.
I use mine for lots of things all the usual like heating home made bread rolls straight from the freezer, making my morning porridge, a quick white sauce , melting chocolate , a few moments for jacket potatoes to reduce the time in the oven.
Plus a couple of less usual things like fatless potato crisps and a sponge pudding that cooks in a couple of minutes.
We use ours less and less as time goes by. These days we only really use it to heat up leftovers or unfinished coffees. (not tea) Even with leftovers they are not that much good. A curry or stir fry is OK but that’s about it. They either make things soggy and soft or rock hard. I am fussy about my cooking and I like natural heat - preferably gas.
There’s a Pakistani takeaway near us, we have a special arrangement with them, for £5 we get a box of briyani spicy rice, no chicken because the bits are mostly bone and we don’t want waste filling the box, plus a large dollop of the hottest curry sauce on top. We take it home, microwave for dinner, we have kefir in the fridge, always goes well.