I believe there's also a farming one, and a goat simulator, where you get to be a goat and lick things, but the one that I really don't get is the train simulator. I assume you get to drive a train and pick passengers up and drop them off at stations, so you're basically pressing "Stop/Go" (not necessarily in that order) for the duration... Sounds thrilling!
I've seen there's also a car wash simulator, where you pretend to wash people's cars. I don't even wash my own car! Why would I invest my time into washing pixels from a pixelated car?