The Maritime Centre to me almost perfectly demonstrates what's wrong with the viewplanes. I think they could probably be done well but there would have to be far more emphasis on urban design.
By the way, they added extra floors to the top of the Maritime Centre a few years after construction. You can see the seam in the concrete if you look closely. I believe that the Centennial Building also had an addition onto its side. Maybe we'll be able to add TD to that list in a few years (although that one will also get new glass cladding)...
Here's the skyline in 1967, pre-viewplanes and pre-tall buildings (from hazegray.org):
I'd like to find some clearer ones from the 1950-1990 period.