Probably one of the most beautiful stops along the road in Banff-Jasper area. But this is exactly the reason it is so crowded. Parking was a nightmare. The only reason I was able to find a spot is because I was on motorcycle. Cars were redirected away, because there were no available spots. I saw people were leaving cars at the highway exit (plazas, and gas stations, with police redirecting traffic already there) and then walk to the lake, which had to be at least an hour long walk from there.
But once you get there, you need to fight a huge crowd to get a nice picture shot, and you can forget for a quite peaceful enjoyment of the nature.
The huge hotel in the back does help a bit with things like food and restrooms though.
Still, worth a stop (if you can find a spot where to).