Nice trip report!
I really like Jasper National Park, but I have only skied Marmot once. I had a really fun day there though. I would definitely ski there more often if it was an easier trip from Calgary. Right now, I tend to visit the park mostly in the fall and spring. The Athabasca Valley is a bit lower than the Bow Valley, and "shoulder season" in Jasper has similar weather/trail conditions to Canmore....it's a nice change of scenery from our regular mountains.
In the winter though....the Icefields Parkway is often a tough (but beautiful) drive. This post makes me want to ski Marmot again soon!