Thanks @Sox Fan Cruiserfor confirming your stop at Santorini. I remember seeing from the land based webcam that it was particularly windy that day.
As for the tendering process. In all the years I have visited Santorini (either with Princess or Celebrity) we have never been on the ship's own tenders. The Islanders provide them and they are more than adequate to transport passengers back and forth without too much delay for sometimes up to 4 ships at anchor! The tenders also always took us to the dock nearest the cable car and entrance to the 588 steps up!
I am hopeful our Sun visit on 13 August will go ahead as the other three ships in that day are arriving and leaving at different times which will ease the pressure on the cable cars, but the passenger count will be 12,000 in total!