Cosmopolit: I left too about a month and half ago and I am glad too. Wait... I am not glad I am happy!!!
I came to Qatar voluntarily and left voluntarily - I was fortunate to have to this option. I feel sorry for those who are forced - by family, economic or other conditions of their lives - to stay in Qatar.
This country and its systems (labour rules, registrations of anything, exit visa, surveillance, monitoring and other) in fact form a neo-slavery society. To certain extent, anyone who is in Qatar and is not a Qatari citizen is a "slave" with more or less chances for exit.
Some people have full freedom to leave, they just have to give up their job, massive salary with benefits paid by employers, houses, cars, housemaids, etc. But this is easy - I know as this was my case too.
Those less unfortunate ones - if I believed in a god I'd say "God bless their souls". But I only can say - I am sorry!