The processes you're describing would be best included in areas of professional graphic arts and photography. The average user who does light editing of family video, records video gameplay and touches up photographs here and there is never going to be working with multiple 36 megapixel images or use more than a couple of layers. I do work with between 5 and 20 layers in Photoshop CS6 all the time, as well as animations with hundreds of frames, and have never run out of memory with 16GB. There is also no indication that the OP is even doing anything of the sort. Most these kinds of posts are by noob gamers who are convinced that if they have more RAM their systems will game better and faster. Not that THIS thread is one of those, just to be clear.
Anybody with a serious concern regarding resources, like a professional or serious amateur, would bring that fact into the light. But thanks for pointing out that there are some situations where more RAM could be useful. I think most anybody running image editing software at a high level, whether professionally or not, or other configurations like virtual machines, would know enough to disagree with a recommendation that doesn't fit the scenario they already know will be likely.