They sound like fun, but honestly I don't know when we'd have used them. We were at the sail away party dancing. As the party ended the horn blew and we were on our way. We were on deck nine for the party - can't blow bubbles over the side there, covered in plexiglass. And I wasn't carrying anything by that time - I'd have had to have been carrying a bag of bubbles, run the kids up and deck and handed out bubbles.
So if you forget them or decide not to bother, I don't think you'll miss them.