How I do it depends on the landing.  If it's long & narrow & deep that just might be the way. 

Having good high boots helps.  I can wade up to my calves and stay mostly dry.  That's enough water to float the canoe.

I don't mind wet feet, but I also don't travel in the shoulder seasons.  Might have to change it up a bit when I do, or at least look at thicker wool socks.  Yeah, there have been some portage landings where we had to climb up the canoe, but most I've been able to wade in safely to at least my knees, and set the canoe down 100% in the water.

Their method looks somewhat reasonable for all of those nice sandy beach entries on flat/calm water, you know, most of what you find in the BW/Q 

I'd have to say that if you drug my canoe through the sand or grounded a bow or stern by sitting on the deckplate or gunwhales that way, I wouldn't be happy.  Joe from Red Rocks is a very good canoe finish restorer, so he probalby doesn't mind the scratches and extra wear.  It is good form to stabilize the canoe for others to get out, so I'll give them partial credit.

Places with deep water and narrow approach would demand this practice.  I know of a few portages that end like this.  Temagami means deep water by the shore.  Places like Sharprock Inlet are aptly named.

Sometimes, once the bow paddler gets in, the stern paddler must shove off and jump in.

Wet feet aren't a problem.  They're a fact of tripping.  Dealing with wet feet is how the British built an empire.

I too gripe when my bow paddler hauls the canoe out of the water high and cantilevered on a rock that's going to punch a hole.