Aspartame has a pretty strong, weird metallic flavor to it, and a lot of the sugar alcohols taste... idk, like a belch after a slightly sweet chemical cocktail? Some taste... airy, or dusty, like an absence of flavor, like there's a gap where you'd usually taste something. Hard to describe but very unpleasant. And the flavor lingers for quite a while. Xylitol is mostly alright tho, sadly it's usually blended with other stuff nowadays.

Personally though I think stevia might be the worst, and it's getting added to everything lately, even stuff with more than enough regular sugar.

Honestly I'd prefer to not taste that, since I think most probably are pretty safe and fine (though I would be glad to see a reduction in sweetness in general). But it's really not a choice, nor have I "gotten used to it" in 40 years, despite it being extremely common.