On tandem trips of, say, 9 nights, we have heavier packs than those guys. Bow man usually out first and holds gunwale while stern paddler gets out.  We just wetfoot it, mainly. Definitely don't want to set a pack down only to pick it up again.  Unless the water is choppy or a noticable current, the canoe carrier pulls the heavier pack (wetfooting) and holds it for the other guy to slip into the straps... Canoe is free, for that moment, so this is not done in heavy wind, etc.  After handing over paddles, etc., the canoe carrier takes a smaller pack and the (kevlar) canoe.  The canoe is freefloating or only very lightly beached, most of the time, and parallel to shore as possible.  More or less reverse at the other end; minimize setting a pack on ground, only to lift it again (though, of course, stuff happens...).