For pure data analysis, the spreadsheet is, indeed, king. To a point...Despite all of these extremely powerful features, the spreadsheet has limitations, which tend to manifest when you least expect it. Often, Murphy's Law applies and the spreadsheet falls over when you are right in the middle of a major undertaking, like month-end or meeting a tight deadline.
You may want to create a workbook with multiple sheets for various aspects of your budget. You can have one sheet that keeps track of savings and investments and another sheet that lists your monthly bills.
Protection of formulae : How often have you forgotten to protect the cell contains the formula that took you hours to test and perfect. It takes one instance of honest human error, and that formula is gone.
Another advantage to using a spreadsheet application for your budget is that you won't have to access the Internet to access your budget. You will be able to view it or work on it wherever you are and if you typically work on a laptop computer and take it with you when you travel, this can be extremely beneficial. Using budgeting spreadsheets to manage your finances is an easy and affordable way to stay on top of your financial game.