If you want to see the Candlelight Processional, just do it, especially if the narrator of the night is someone you want to see.
Between Thanksgiving and Dec. 30 Epcot is open until 9:30 and Illuminations runs then.
I have never bothered with the CP/dinner package. Then again, I’ve never seen more than a couple snippets of the CP.
What I would do is save the extra credit and just station yourself to the right of Lantern 1 sometime around 8:45-9:00.
Other good viewing can be found around the little pier on the German shoreline (Lantern 8 area), that plaza in front of Italy (so long as you can get all the way out there), just to the right of the arch in the water, and from the bridge between England and France (closer to England). There is also good viewing from the Canadian shoreline, mostly to the left of that “rock” and continuing to the left and the Friendship landing.
That center area of World Showcase is good, but there’s a whole plaza that is not opened up until 15 minutes before the show because it needs to be determined if the wind is blowing in or out. So, there is always a large group of people there and it can pack tightly and stay packed tightly because half of the area is roped off.
Now, these suggestions are also based on someone who wants to tape the show with the least obstructed views obtainable. If you aren’t taping, just try to be sure you have a clear view of the barges in the middle of the lagoon because that is going to be the area of focus. The islands can be real obstructions, especially from the France/Morocco border and also from some parts of China and Norway.