Of all the musical numbers that Beauty and the Beast will have, both returning and new, it makes sense that this will be the one almost completely full of CGI. The sequence features Lumiere and Mrs. Potts, the anthropomorphic candelabra and tea pot, singing to Belle about they'll make her feel comfortable around the castle following the young woman's imprisonment. This leads to a hectic performance of the other enchanted denizens serving her food and having a romping good time. So yeah, aside from Emma Watson acting in front of a green screen, there wasn't really wasn't any way to pull off such a chaotic sequence without relying on all those effects.