I always book excursions I REALLY want early from the ship and then research and determine what way I want to go. I know that's why you now have to pay up front for the excursions. I've got on the waitlist before once aboard for a last minute excursion we wanted to do and too lazy to research, and have always cleared. I'd rather skip going somewhere than do a LONG big bus excursion. Mount St Michel was the LAST one I'll do.
Folks are always saying that the ship will add extra buses, etc if full. What's the difference between Waitlist vs Sold Out. Is it the number of cruisers on the Waitlist? Was asked and I couldn't answer.