Wow. This post actually made me feel bad about my upgrade because it shows how little the 6S has "improved".
New 3D Touch - Yes. Very cool and will improve my workflow
New 4K video - For the stuff I film then I don't need quality this size at all
New 12mp camera - more megapixels, same aperture and tiny lens
New 5mp camera - Nice, but lack of wide angle lens still make it primarily for narcissists
I know there more to the new iPhones that will make a difference (2GB RAM, Processor, Harry Potter photos) and I do feel 3D Touch will be amazing a year from now when Devs start utilizing it, but when you start thinking about how little the things you listed will affect your workflow then it shows how minor this upgrade is to most people (and how much room there is for the 7 to be a proper upgrade leap.)
Just curious, what were you expecting?
Looking at previous generations:
3GS added faster 3G
4S added Siri
5S added TouchID
IMO, this is the biggest S upgrade ever.