Is it normal to become sweet-sensitive after going vegan?

You've just gotten used to not having much sweet food in your diet.

I eliminated sugary foods & drinks out of my diet about twenty years ago, because of my type 1 diabetes diagnosis, & now, I prefer savoury food!

You might benefit from some fruit in your diet though!

It's very possible, I used to eat foods that had a lot of sodium and thought it was normal but now I eat pretty bland foods (for health) and when I eat out, it seems REALLY salty.

I don't know about veganism specifically but can tell you that if you don't eat something regularly you do become more sensitive to the taste of it. I usually put 2% milk in my coffee. If I happen to use whole milk, it tastes more like cream. same thing happens with salt. No reason it can't happen with sugar too.

Yeah I was the same

yes, i think so. i find that anything sweet sets me off on a craving for more sweet things even if it's grapes and cherries. i try to leave them alone completely.

Aging in general does that

that is not because you became vegan, its because you aren't eating many sweets so they taste sweeter than before..Same thing happens when you cut down on salty foods. After a few days, many things I ate before were beyond too salty and simply not edible.
I often heard that same complaint from my late hubby who was put on a low salt diet and when I worked in health care food service, we heard that often then as well, from newly diagnosed diabetics who had to cut sugar and newly diagnosed high blood pressure patients who had to cut salt.
It has nothing to do with being vegan.
Its the same phenomenon that occurs when people eat spicy foods and soon want spicier and spicier foods because it takes more to get that same level of flavor.

yes, some foods can taste different after becoming a vegan it could also change who you are believe it or not. some people say their grades dropped and and they weren't as happy when they went vegan. i became more calm and just all around a better person. the point is, being vegan can change a lot.