DW and i have found the closer to Xmas the greater the crowd; weekdays a bit less; and the early shows were less crowded than the later.
all that being said the standing room at the back which is roped off provides an excellent view of the festivities, you just aren't that close. I take it to be like the movie theater, closer you are the less in view without scanning.
so assuming you have some flexibility, you can save the money for the dining and be assured you can still have a fine view of the show.
Pop