This link describes how the AAA Enhanced FP works:
"The Joy of FASTPASS - details and secrets" -
http://www.micechat.com/forums/showthread.php?t=5720
If you are already planning to stay at a DLR hotel, getting the AAA EFP is a no-brainer in my book. If, on the other hand, you are trading off the cost of a DLR hotel vs. a good neighbor hotel and whether the extra cost of the DLR hotel is worth it solely to get EFP, I would say it depends on the individual but is not worth it for most people.