Sure, I agree there aren't many highrises in Europe, but there's quite a bit of new postmodern glassy development all around historical places.
Take, for example, the 70 foot glass and metal pyramid right there smack in the middle of Louvre, one of the most historic places in all of Europe.
Another example would be the Guggenheim museum in Spain or maybe terminal 4 at Barajas airport. One that stands out in particular is The Dancing House in Prague. These buildings may be a stark contrast to the extremely old buildings around them, but they do prod and poke a little bit and make you realize you live in the 21st century, not the 18th!!
Guggenheim:
Dancing House:
But in America, we tend to take things one step further and make our buildings a bit taller. A perfect example of blending old and new is the Hearst building in NYC, which has the historical base and a towering multifaceted glass box soaring above it. I think it's a great compromise of old and new, since they could have just as easily razed the old building to the foundation!
And for Vancouver's Granville Island, there are no highrises immediately adjacent to the property, that is true. But take a look at this photo of Granville Island to see what I mean about the contrast of low and high, it's quite pleasing!