Like the article says, it's often with food where I wouldn't expect to find artificial sweeteners, but there's a very distinctly odd, kind of sickly sweet taste that I'll notice sometimes; whenever I do, I check the ingredients label and always find fake sugar on the list.
Real sugar makes me feel worse, but differently worse, if I consume more than a small amount at a time. However, small amounts of real sugar seem subjectively less poisonous than small amounts of fake sugar, especially if the real sugar is buffered by other non-sugary food (e.g. a drop of maple syrup in oatmeal vs. a gummy bear on an empty stomach).
The only exception to my fake sugar rule is that every once in a while I go for a pack of Orbit/Trident/Extra chewing gum, or a Diet Coke / Dr Pepper / Red Bull (yes I like the taste) when I'm on a long car ride and I want a little caffeine and something that tastes entertaining to fight the boredom. My stomach always hates me for it, but it's a once in a while thing, and I appreciate my body's reminders that I shouldn't consume that stuff on a regular basis.
I hear you that artificial sweeteners taste surprisingly good but I love natural sweetners and if I want to taste sweetness I love whole dates.
You might also find that Mexican Coke in your grocery stores, which I believe is more likely to be sweetened with cane sugar.
I'll usually notice a flavor change when they make the switch (like, oh, must be Passover), but I couldn't tell you which is which by blind taste test. I don't drink a ton of Coke either.
What happens with your liver and pancreas in response to something sweet crossing the tongue can work against you... it's amazing how sweet everything tastes, too much so, when you don't eat refined foods (including sweet fruits) for a while.
I sometimes add unsweetened cocoa powder or vanilla to spice it up, but more often than not just drink it straight up.