Unfortunately lots of people do, so I thought it appropriate to address the other side for very assuming people who absorb one-sided information.
If someone wants to write an article about "the other side" then write something about the users for whom Zynga's products are actually providing value as opposed to serving as artless black-holes of attention and creativity.
I think games have incredible (and untapped!) value, but I don't think Zynga makes games. I think Zynga exploits game mechanics to make products out of people.
Obvious example: http://www.bogost.com/blog/cow_clicker_1.shtml
Positive or not, this industry can lead one to feeling like they have to give every waking hour to the company. At the end of the day, though, one really should ask "what am I getting in return?"
Balance is key.
I don't work at Zynga, I've heard stories like others, but you know what, I wouldn't assume anything about them until (if I did) I interviewed with them and inquired about a position I was interested in. In general, gaming studios work more than comparably sized non-gaming businesses.
This particular article/blog has no more merit than the stories of ZOMG ZYNGA IS EVIL AND WORKS THEIR EMPLOYEES TO THE BONE.
My experience in the tech industry is, an employee will have expectations, a company will have expectations. As the employee, it is your job to look out for yourself and make sure that what you are getting into matches what you want. You can easily get sucked into the day to day and forget or not realize what you are giving up, you need to be aware enough to take stock from time to time and ask "is this working for me?"
Just a minor (well major) nit... Quoting someone who says "my job is my social life" -- if most of those hours are in the office working, you need to get out and live a little. Especially if you are an employee and not a founder.