I just did Whitney yesterday car to car. I carried micro spikes and an ice axe, but only used them on the descent from Trail Crest. Everywhere else it was easier using trekking poles; the steps are cut in to the slope of the chute. Plunge stepped down the chute following the zig zag tracks using the spikes and ice axe on the high side. Would not recommend glissading as once you get out of control, you're going for a long ride, plus it hurts your butt. Mileage was considerably shorter going straight on the snow.