Goat Simulator is a parody of bad sim games, good joke but usually doesn't provide mode people with hours of fun since it is very short.
Euro Truck Simulator 2 is pretty decent as an actual simulator, it is relaxing and has a pretty decent build your own trucking business from the ground up gameplay in it.
Flight sims are pretty self explanatory. I don't know of any other sims that are good or don't suffer from a terribly low budget.
Wait is Euro Truck Sim basically just Patrician but with trucks instead of ships?