I Think what I will miss most is some of the great Black and White films which digital doesn't seem to be able to come close to. PanX developed using direct positive to produce Black and White transparencies is absolutely beautiful. If you have never tried it, you should before it's gone. Also, I forget the film name right now, but there is a scientific B/W film that you can use a special low contrast developer for that produces sharp 4’x6’ B/W prints with almost no grain at 12 ASA.
I will miss film so much. Kodachrome, Fujichome, PanX, CibaChrome, Tri-X, VPS, etc...
My personal favourites in black and white are the Ilford products, especially Pan F and HP5. HP5 pushed to 1600 or 3200 can produce stunning results- very grainy but the grain pattern is such that it enhances the image. I also like shooting with IR film- HS infrared and Ektachrome Infrared will definitely be missed.
If it is not for a scientific or strategic application, just artistic, then grain is an acceptable conscious decision.