A lot of people considering budgeting a chore but I think it's liberating, because once you meet your obligations and goals you can rest easy knowing you're on track, and do what you want with the rest. There is no worrying about money, there is no fighting with your spouse about money (which is supposedly the single biggest cause of stress in marriages). Every expense you have is accounted for before the bill even comes. There's no wondering about whether you can afford anything or whether this vacation or that purchase will wreck your finances.
So for those reasons I'm kind of a personal finance geek and motivation isn't a problem. I'm constantly tinkering with our situation, trying to eek out a few more dollars here to apply it to that goal over there. But in terms of my budget, I look at the entire picture any time there's a life change, annual benefits elections, or a major change to some area of my budget (like adding a cell phone line, for example). So on average it gets a look a few times each year.