I agree that 'Infill' has lost a lot of its meaning in the recent years.
In this picture, you can see the original mid-50s houses and their trees. Behind them is a development which went in in the early 80s. It is a neighbourhood of garages with attached houses in the back.
Note that the trees and bushes between the two belong mostly to the older properties. There just isn't the space for large trees on the small lots.
Then, notice the re-development which happened in the early 2000s! It is a lot-line to lot-line single home. Huge resources for one family.
But this discussion does seem to be getting away from Greenbelt Development.
