Me too, it was one of the biggest things that stuck out to me when I was in Montreal. The amount of light everywhere really contributed to the 'party' vibe I think.
The lighting looks much more garish in these pics than they do in reality. The little green squares are very intense at the top, but the green lighting on the facades is much more subdued when you see it in person.
Imagine waking up from a decade-long coma and seeing this photo. What would go through your mind? I find it hard to process even having been relatively lucid these past years. Just stunning.