We were there on Wed 12-06. We had the dinner package and were eating at Germany at 5:05 for the 8:15pm show. When we took the boat into Germany, the stand-by line stretched all the way back almost to the Germany boat dock for the early show. When we left after eating dinner around 6:15pm, the stand-by line for the second show was almost as long as it was earlier. When we got into the dinner package line at around 7:45 pm, that line stretched all the way to China (OK, so that is only one country over from America - still it sounds more impressive to tell people we were in a line that stretched all the way to China and not be exagerating, haha).
This was during an "uncrowded" week based on everything else we saw, and the speaker was Brian Denehey. I can only assume that the crowd closer to Christmas will be worse, especially for someone more popular, such as Kirk Cameron. If you don't have a dinner package, I'd say you'll need to be back for the stand-by line no later than two hours ahead of time, and even then you might be stuck waiting for the second show.
As for package seating, we were told that all package customers are guaranteed a seat before any stand-by people are seated at all.