Mine really is on board. In part because his parents are horrendous with money and we don't want to turn into them, and part because he was the only one who brought major debt into our marriage (I had $900 of a cc, he had $12K on credit cards from when his parents refused to pay his tuition and $22K in student loans). So I think he feels slightly bad/guilty about that.
Granted, we've since bought a car (which'll be paid off a year early this fall!) and a house, but those were definitely joint decisions.
I'm the one who does the budget every month, tweaks it, makes sure we've got everything in there. Then dh and I sit down for a few minutes and discuss it. Then I may do some more tweaking. When he pays certain bills, I just tell him how much to put on 'em and he doesn't question me. And really, he *is* on board. I mean, we've gotten rid of $8K of debt since August alone, and will get rid of even more with an unexpectedly larger than we were expecting tax return.
I think what hammered the whole budget thing down for him (i.e. we make plans for all his income, so every penny is accounted for) was when our oldest was turning 3yo.
Dh wanted to buy me a new-to-us laptop from craigslist, even though my 10yo laptop was still slowly chugging along just fine. I told him we could either buy the laptop and do no party and no presents for our 3yo, or do the party and no laptop. Not both. It seemed to stun him for a few hours, and it seemed to just click.
But. When we do have a little 'extra' money - like the tax return or it's a 3 paycheck month or dh gets a bonus, we do a little something for him or a little something that's fun. Like with his Christmas bonus we went out to dinner at a super-fancy restaurant and went to a movie (the kids were at home with Grandma). We would never go to that restaurant on a regular basis unless dh was pulling down over 3 times what he's currently making.
Part of our tax refund is going towards a chainsaw that dh has been lusting after for close to a year. We heat with wood, so it's not a useless purchase by any means (he goes out woodcutting with a friend). But things like that make him happy. On the flip side, I also put a little extra in our gardening budget for this year from the return so I while I still need to be frugal, I probably won't have to choose between drip irrigation or a compost heap - I'll be able to figure out how to do both.