I,v done the night cargo thing like and redsnail tells it like it is but I got more respect from the company than i did working as a licenced ground engineer for British airways who were the worst people that I have ever worked for in the way that they treat there engineering staff.
Fortunatly more by luck than judgment I have found myself flying the 737 for an airline that is run by an enlightened management team ( at least on the pilot side ) and it is without doubt the best job that I have ever had despite the long hours............it shure beats spending all day in a 707 fuel tank with a rivet gun !.
We do have a few people who are unhappy in the industry but most of them are the types who have got to be a pilot via sponsership and have never had to do a " real job" , to them what most people call work would be an unwelcome and unplesant shock.