Shazerac pretty much took my words out.

I will add my sympathy to what you're experiencing, it's very similar to what I felt and experienced in my past work.
I stopped working there not a long time ago, and I still have some burnt feelings of "why did it end up like this with X, Y, Z?", or "why couldn't I connect with X, Y, Z more?" for instance.
By understanding that eventually every worker cares foremost about his day's worth, it helped me take the relationships with them more casually, which has made me feel allot better, adding to a better balance of work+human interaction