When we were on NCL we did state that we wanted to eat with others and were always seated at a table by ourselves and no one else was ever brought to the table. It seems that (on our cruise at least) the rest of the passengers did not want to sit with others. And the host/hostess sure didn't do much of anything to sit more than one party to a table.
On Princess they always make sure to fill a table before starting another. Unless of course the next party to come in is for more chairs that are left. But not so when we were on NCL. Of course the dining rooms never were even half full. Maybe one forth of the table would have people at them at any one time. And this was on the Pearl which was built for freestyle.
Star Princess 2005, Sun Princess 2005
Caribbean Princess 2006, MSC Lirica 2006 , NCL Pearl 2007, Majesty of the Seas 2008, Carnival Destiny 2008, MSC Lirica 2009, Carnival Valor 2009,Carnival Legend 2010, Carnival Liberty 2010,Carnival Fantsay 2011,Carnival Valor Feb 2012, MSC Poesia Dec 2012, MSC Poesia April 2013, Carnival Legend Nov 2013, MSC DIVINA Jan 2014