Very curious about what they mean by that. Anytime is an option just like Early or Late - they just click the box. No more of a pain in the butt than booking the cruise.
As far as making reservations, I've had no issues doing that. Yes, it used to be that you had to do a day, check out; do a day, check out; and so forth - so a little time consuming, but not horrible. Lately, though, I've been able to go in and book all the days before checking out so it's a lot easier.