Mine's opposite to yours.
I don't think I can differentiate the differences in taste as well as I used to when I was little. I personally don't think my tolerance for hot foods has changed over the years, but those around me seem to think so, so perhaps it's been too gradual a change for me to notice. To me it seems they're actually going backwards on the hotness scale.
I don't have to add more spice to foods to enjoy them though. The only other change (besides increasing heat tolerance) is that I tend to prefer my food (noodle broths, pizza etc) saltier than my family members.
Were they of the steamed/boiled or fried variety? I prefer steamed over fried as it retains its flavour a lot better, while the fried-only variety is too oily and masks the taste.
3 weeks ago, I found a little restaurant run by a french guy and his Korean wife.
Very simple menus, maybe a tad expensive for the quantity and the place.
But their Jiaozi are just exceptionnal. I was so surprised the first time I immediately re-ordered some after finishing the very first one. I don't remember ever having such a positive reaction.
Around a year ago however, I encountered a method where they are lightly fried before being cooked in 1.5cm of flavoured stock (usually chicken). It combines the previous methods quite nicely - retaining much of its original flavour plus the caramelised aroma of pan-fried pastry.
The restaurant that did that actually sold them as "steamed" dumplings, funnily enough. I think their "fried" variety was actually "deep fried"...