It’s a pain to get to, but it’s worth it.
This pithy assessment is along the lines of the Buckley’s cough syrup slogan:
It tastes awful. And it works.
I’ve never been to Lake O’Hara but I have family members who rave about it, and my parents went there for years to hike, take photographs, and enjoy the view. And what’s not to enjoy?
There’s a lodge and a campsite (reservations recommended, available three months in advance). You can’t drive up, but you can take the bus, if you can get a spot on it. All in all, it seems like Parks Canada has its act together on this one: limiting access to maintain the spot in a condition that people will appreciate once they get there.