One of my co-workers sent me this e-mail after my departure:
"Thanks a lot for your assistance in the past, and if need be in the future. The only person that was here to provide stimulating conversation is no longer - you. Days and afternoons will be boring now.
I do wish you all the best that can possibly come to you, and that you find deserving employment soon. I am sure that my surprise was equal to yours on Friday, but I guess the "perfect fit" was more important than an individual who was willing at all times to assist, and one who had work ethics similar to mine.
I am sorry for their loss - not yours.
Keep well and good luck."
I think that is the nicest thing anyone has said to me after I have left a company.