Lisa and I both have at least 13 Disney cruises under our belts...each....so we're pretty experienced.
Most of the time, there are only two people working the Guest Services desk. There are times when it's quiet for them, as you mentioned trying to choose a time like that. But honestly, and I'm not trying to be rude, but booking future shore excursions, Palo, etc....for an upcoming cruise....is not in their job description, and it most likely is not even something they are capable of doing, since it requires being online, connected to the
DCL website. It's just not a perk (or whatever you might call it) that they are even capable of doing at this time. It's not that they wouldn't
want to help you....but I don't think they have the resources for it.
Then you also get into the area of if they do it for one family, they'd end up doing it for everyone eventually, and wouldn't get their own jobs done. And you have to know that while YOU may be polite and choose a time when it looks as though they aren't busy, not all people are going to be that nice and thoughtful.
Maybe it would be a good idea for DCL to have a dedicated desk with one or two people, to handle this type of thing. I think that's something that people would really love, and I know that none of the other cruise lines that I've been on offer this as a service.