I know that more work feeling, but for me it was TI-83's (I think) and I rarely used the programs I wrote. I was quicker doing most work(80%) in my head and using paper to make sure it looked correct.
So why did I write the programs at all? Boredom, really. It was also a good way to make sure I really understood formulas - if the calculator was wrong, I made a mistake or typo.