Yes, the ceilings and historical details are nice. I even laid on the floor under to take just the right picture of one of the ceiling tiles. But after seeing that, what else was there? Really nothing. I live in Toronto and perhaps I am spoiled by our amazing Union Station's architecture, but this place felt kinda dead. There wasn't the hustle and bustle of an alive train station, which is one of the things I love about Toronto's historic landmark where millions pass through each day.
If you have kids travelling with you I guess there are things to do for them, but otherwise, unless you want to lay on the floor and take a few great ceiling pictures (in which case stop in for 5 minutes), I say skip it.