Well, I have a household expense budget but it is rare that I actually make my magic number each month.

My dh does the bills and does everything online that he can. We don't carry credit card balances. We have money taken out for retirement and all that every month. We have a large cushion in our checking account. We aren't really uptight about it, but we try to be careful about our spending on the things we can control. We sit down about once a year and discuss our finances and talk about how much I should be spending each month, since I am the one that spends the majority of the money to keep the house running smoothly.
My budget is $1500 a month and this is supposed to include stuff like gas, groceries, eating out, birthday gifts, Target runs, etc. (no bills). I write down my expenses on a page in my calendar to keep myself on track. If I didn't do this, I would do like someone else posted and spend way too much on groceries and eating out. Those are my problem areas.

My dh takes $80 out of the ATM each Friday and that is his spending money for gas and eating lunch out a couple of times a week. It used to be plenty for him, but now that it costs him $60 to fill up his car we are going to have to reevaluate that. For the last 4 or 5 months I seem to be going about $200 over my budget each month because of gas and grocery prices, so we will have to reevaluate that as well. It is probably time for another sit-down. Blah!
But as far as having cash in an envelope or whatever, no we couldn't do it. We need to be more flexible than that. I like being able to check my list and see what I have left for the month though, because I am a planner. It makes me feel like I am doing my part for our family too, since dh works so hard to take care of us.