I have the same Late 2013 model. I don't really feel that compelled to update yet. Tempted, absolutely. The sleekness of the design and the display are great. Justifying it is hard. I need my ports. Adapters I could live with, but only two USB-C not so much. An 11-12% jump in CPU isn't really worth it. Battery life on the 2013 is already very good. The most worthwhile upgrade is probably the graphics.
Sounds like we have different use cases. For me, I think I will wait another generation and see if the value proposition on the Touch Bar models gets any better. If the current model meets your needs and has features you're looking for, I'd say there is enough to make it a worthwhile upgrade for you. Go for it.
What ports do you normally use and what for? The only time I can remember using more than two ports at once was when I was watching a movie on my TV (HDMI) from my external hard drive (USB), and charging at the same time (MagSafe). This is an avoidable situation, but could be an inconvience rarely.
I don't use external displays, SD cards, or any other peripherals. Mainly just need to plug it in, and plug in my iPhone.
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What does the 2016 model do, that the 2013 doesn't?
Not much, which is why its a tough decision. It's a want vs need. New design, gorgeous display are the main driving factors. My 2013 is still very much capable, smooth, and fast.