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.