Having spent my time there, whilst i'm far happier where I am now. Even after 5 days of 4am alarms, I always felt it was worth it to get 4 days off in a row. I cannot state how good knowing you have 4 sequential days off in a row ad infinutum is. (Almost 5 when you transition from early to lates. A 3/4 day mini break possible every single week - and you can plan it months in advance due to the fixed pattern roster. No other airline in Europe offers this.
As I say, I'm happier where I am but I can understand those that won't leave simply due to 5/4.