We went last Dec. the week prior to your trip & the crowds were heavier than I anticipated, however, not overwhelming. We went last week & we literally walked on the rides & attracations - no wait at all for much of anything.
Last week I did miss being able to see the Xmas decorations & also the Osborne Lights - they are not to be missed. They are spectacular. Hopefully, next year we can return in Dec. & be able to see them.