I’ve budgeted for the past 20 years. Initially, I used Microsoft Money and, when that was discontinued, I migrated to Quicken.
There’s a business idiom “If you don’t measure it, you can’t manage it” which I think is applicable to managing personal finances. Off-the-top of my head, I have a reasonable hunch about monthly expenses including my mortgage, Internet, cellphone etc. Other bills, including gas and electric vary particulary between Winter and Summer.