We也是遇到罢工 and then 坐船去santorini

We 遇到罢工 when we were in Greece too. We were only notified that the flight was canceled when we arrived the airport around 2pm (the flight would be 4pm).
We got the 5-hours ferry tickets at the airport. The ferry leaves from Pireus 7pm and arriving Santorini at 12am according to the schedule (the actual arrival time is almost 1am). I think the final destination of the ferry is Crete.
The ferry does have separate 吸烟区, however, you can still smell the smoke in 不吸烟区 unless you stay far away.
We didn't stay on the "numbered" seat but in the public lounge area. As long as the boat is not crowded, there is no problme for you to 占用两张椅子. Most of the big long sofas which you can lie down are close to 吸烟区 so we stayed on the small sofas, which is OK.