Have you ever tried just a small dose of CP/M? It does wonders for the digestive tract. 

I remember back in the really Dark Ages, when Lacerte had an accounting program that ran on CP/M. Input was really slick - Heads down, account number - amount - enter - Repeat. The problem was processing or sorting that data into statements - Get ready for lunch early and start the program - Stay for dessert - come back and have a cuppa joe - get rid of all the processed lunch - stare at the screen for a while then VOILA!

My machine d'jour was a Kaypro 10.