I suffer from ruff feet too. I can't seem to break the habbit of walking around bare foot! What I do to keep my feet half way decent:
Every day during shower I use a fine foot buffer thingie and then when toweling off I rub the towel extra ruffly on my feet.
Once a week (or so) I soak my feet in warm water. I use very fine sand paper to smooth them (much cheaper than all the feet buffers and just as effective).
At night I lather Utter Balm on my feet and cover w/white socks so that it has all nite to do it's trick :)
When I first started this regiment, I did it daily. After your feet get to where you can live w/them again once a week/every other week works. During the summer I have to up the routine to keep them ok