It seems like a lot more work. Each of my cards had a certain purpose (I use 3 cards), so all I have to do is see what the balance is for me to know my expenses for the month. Annually the credit cards give me a summary statement and that tells me expenses for the year.

Cash for me disappears and I have no idea what I spent it on. I have no desire to deal with receipts/extra clutter. And I have no desire to manually have to keep track of anything.