We booked our honeymoon package through our awesome cruise-only travel agent, so all we had to do was look in the brochure and say "we want that!" and Mary Kay took care of the rest.
We boarded the ship quite early - probably the first or second transfer coach - and parts of our package we already in place. We had "just married" balloons outside our cabin! No reminders of any kind were needed.
We were slightly concerned that our bridge tour would be cancelled, remember this was only a few months after 9/11. We got an invitation in our "mailbox" a few days into the cruise detailing the time and place for the bridge tour (unfortunately, it conflicted with the blackjack tournament, but a techno-geek like me just HAD to see the bridge).
Everything went flawlessly - I don't think these packages would generate much (ahem) "romance" (cough cough) if passengers had to keep bugging the staff for their paid-up bonus items.
If you're into things like keeping the robes (I'm wearing my Princess robe as I write this), or getting a "free" 8x10 photo, just check into the individual costs of these items. It's probably a bargain compared to buying everything separately.
Plus, I like to think your cabin steward and/or waiters will be informed that you've booked a honeymoon or anniversary package and treat you accordingly!