Its funny what UPS can do to a man or woman. If the place was truely horrible we would all leave. I'm not saying UPS is wonderful and everyone should dance their way into work everyday, lol.
It is what it is though, its work. If you could do better somewhere else, you might leave. Even then you might not becuase your not sure about the viability of that company. With UPS you are pretty sure you will be employed as long as you want to be.
I get up every morning and my body is sore. I ask myself how long I can continue and if I want to continue. Then comes the end of the day. I'm driving back to the center totally relaxed and am thinking "today wasn't so bad". When Friday comes I'm all for conquering the day and I'm jacked up that the weekend has arrived.
If you leave UPS its only going to be tougher for you. 99.9% of jobs suck. We have a job the may "suck" but it pays well, you can make a living and plan a retirement from. Thats the way I look at it.