This sounds just awful. I've had some pretty bad mgmt jobs but this definitely takes the cake. You should have skipped the mgmt job and just been a three night a week bartende, in town, away fronm the mountain. I've had many summers like you describe, most people can't fathom what its like to work like that.
Absolutely working a line level job is the way to go if you want to ski a lot and have a life outside of work. Most bartenders I know in ski towns can make as much $$$ annually as the F&B managers of the resorts while working only 3-4 days a week and having 3 months of the year off.
The downside is - no health benefits. If I was smart back when I still worked in ski towns, I would've stuck with bartending and married someone with health benefits. :lol: