Pinemarten,
2 Phase is still used, although not as much as it used to be.
3 Phase is used more often because it gives a better balancing to a Supply system.
However, Industrial Welders still use 2 phase.
Over here in NZ, we still have cookers that are connected to 2 Phase + Neutral, for places way out in the country that suffer from Voltage Drop. [Linked Image]