I've only ever lived in the GTA, though. It's my understanding that in many places away from major cities there can be a shortage of doctors.
Canadian living in US as well. The one thing I've noticed is the choice of healthcare in the US (for those with good insurance). Have cancer? Pick the best hospital you can find in the area. In Canada, you might live next to a world-class institute or it might just be a regular hospital. That's where you go.
But yes, healthcare in Canada is very good. The other thing I would call out is that experimental/cutting edge technology is often available in the US before Canada.
For anything other than that I've had effectively zero wait time and excellent care. There are even free health lines you can call for basic info.