I never felt homesick, truthfully. But I did get low. Low from loneliness.
Today though I went with wife, daughter and son. The food hadn't changed much (except I don't remember being able to get a thin crust pizza before) and so I had sensory memories triggering the loneliness of the long distance suit salesman stuck in a newly welcomed city, but also the realities of excited three year old, baby boy and a wife with her own memories (separate form mine) of ancient Pizza Hutting.
My daughter, who is more perceptive than I am, enjoyed many parts of the visit but was, overall, underwhelmed - being more interested in her new Tinker-bell costume.
There's a lesson here somewhere.