I'm not so sure housing prices there are booming any more and construction cranes tend to be a lagging indicator. Office vacancy in TO now is getting close to Edmonton levels, not a good sign for Ontario.
I used to have relatives that lived in Hamilton and actually think it is nice. It was a place that some snobs in the GTA turned their noses up about before perhaps because it was too blue collar (sound familiar?), but with TO being so unaffordable more condo development in places like Hamilton makes sense in the long run. They have more character than some of the other GTA suburban communities and actually already have a downtown. I just think the next few years will be not so great and bumpy.