The McKenzie is good, and our guides have been having fun days on the river with a Dry Dropper set up and a Euro Nymph rig. 
I have not heard them talking about Green Drakes yet, but that should be happening soon. Orange #12-14 Elk Hair Caddis, Olive Elk Hair Caddis #14, Black or Red Hippie Stomper, Big Chubbies, Light Cahill, H&L Variant (President Herbert Hoover once fished an H&L Variant on the McKenzie!) plus larger Perdigons, Caddis Pupa and Leeches have been great.