I like the “taste” of the bubbles of CO2 on my tongue-but what are you tasting? Is the CO2 (being acidic) stimulating those receptors? Or, is the taste of carbonated drinks something else?
IIRC, it’s pain.
The carbonic acid, formed by CO[SUB]2[/SUB] in solution in water, is part of the taste of sodas. It has the side effect of making the drink fizzy. 
Another acid, phosphoric acid (H[sub]3[/sub]PO[sub]4[/sub]), provides a tangy or sour taste. It’s more of this acid, plus a different sweetener, that is the difference between Coke Zero products and Diet Coke products. (Zeros have more phosphoic acid.)
One of the things that drives me nuts about the frozen drinks. They don’t have the fizz, so the formula for the syrup should be different, but it often isn’t, leaving you with a much sweeter drink.
Also, thanks for telling me the difference between Coke Zero and Diet Coke. I knew it wasn’t that Coke Zero actually tasted like Coke.