Honestly, I saw the trailer of Frozen... and was both laughing and groaning of the stupidity of the situation. You just have to jump off the lift. Really, that's all you'd have to do to get out of being stuck on a ski lift. You have skis on, there's so much powder on the ground that if you don't land upon the slope, you'll just fall into the snow. Hell, I've seen skiiers fall from cliff sides for hundreds of feet and be totally fine.
I don't know how anyone would consider this scenario scary at all.