Must say I have been with the company over 25 years (UPS acquired my old employer), and with the amount of time & money they have invested in training/grooming me for my present role leads me to state that I have no grumbles whatsoever with UPS. I certainly do not feel undervalued or 'just a number'.
I cannot believe I am in the minority here and am surprised that others like myself have not come forward. I appreciate that people do at times feel they are neglected/treated unfairly and I have seen my fair share of people leave during my 25+ years.
However, ask 65-70% of those people (still stay in touch) if they would come back and they would jump at the chance. Grass is not always greener on the other side...