YES. DO IT. Games will load quicker. I definitely noticed going from 8bg > 16gb in games. Especially games like battlefield or games with long load times.
With respect, the ONLY way that is true is if you are already using all 8GB of your ram.
Also, when BF4 loads, it loads from your HDD... THAT is the biggest bottleneck when loading. I have it on two PC's one from an SSD the other from a HDD and the one with the HDD, even though it has 16GB of ram loads way WAY slower.
I went from 8/16 on a platform change, wasn't using all 8GB