The big advantage of cash envelopes is that, if you budget properly, you will always have the cash to pay a bill when it comes due. No more worrying about where the money will come from, be it for mortgage or rent, utilities, car payments, repairs, taxes, discretionary spending, etc.
The use of budgeting worksheets will make the process of creating and maintaining a budget so much easier. Many people don't live within a budget simply because they find the process of creating a budget so overwhelming. While it can be difficult to account for every dime you spend across several categories, the rewards of doing so can have a huge, positive impact on your future.