I am surprised to hear this. We were told after one such incident that they would never leave a couple who had children onboard. Our incident occured in St. Thomas in 2002. Our departure time was supposed to be 4 p.m. For one hour they kept announcing the name of two women in two separate staterooms. By 5 p.m. the port side of the ship was lined with passengers waiting to see if these women showed up. As we were watching, we saw a man get off the ship with all his luggage. Shortly after, we see two women stumbling down the dock arm in arm just looped! BOY did that husband looked pissed! We left one hour and 15 minutes late. As a result, we were late to
Castaway Cay by an hour the next morning!
Well, since they kept announcing their room numbers -- everyone knew what they were. So the next morning at breakfast we got an earful about the whole story: CM told us the reason the captain would not leave was because one of the women had a small child onboard and was sailing alone. Secondly, the husband of the other woman had been told he could wait it our or pack and disembark in case she didn't make the sailing....so he did. And thirdly, CM said that the women got a lot of not very kind notes stuck on their doors, one of which apparently said "how does it feel to keep a whole ship waiting".

That night at the Captain's dinner we asked him if he would have eventually left without them and that's when he told us about the child and it just wasn't a decision he wanted to make
And as another pro to taking a Disney excursion.......in Barcelona in 2007 we were on the Montserrat excursion. We had what probably is the dumbest tour guide we've ever had. She gave the wrong instructions to an elderly gentleman in our group (who was travelling alone). She told us to be on the bus at 3 p.m. -- but apparently told him 4 p.m. After they spent a very long time trying to track him down, and after calling her supervisor, they decided to leave without him! Montserrat is NOT a short ride to the pier! As a result of her mistake, we lost the opportunity to see La Sagrada because we had to get back onboard.
Everyone was so concerned for the gentleman, we all went up on deck to see what unfolded. Of course, the ship HAD to wait for him. Suddenly here comes this cab with a VERY upset and frazzled gentleman. An officer got off the ship to pay the gentleman's cab. However, the officer left the ship without his ID and the dock police would not let him back onboard. So another officer had to get off with his ID to get him back onboard

What a mess all because one tour guide misinformed a member of our party.