Do you always take/stash your receipts? Does everything you spend money on provide them? Do you have a central repository for receipts so they don't end up running around everywhere?
I think tracking money is always an "after the fact" sort of thing, separate from the budgeting one does in advance. Unlike Eric (^) I hate doing "3 minute per day" type tasks, I'd rather sit for an hour and go through it once a week/month. Although I mostly spend on a card, I've been keeping my grocery and shopping receipts so that at the end of the year I'm not like "when did I buy $3k of stuff" or "why am I spending so much on food!" I don't do it for other expenses because certain vendors are pretty self-explanatory ("netflix," "zipcar," "Sushi place," etc)
From the standpoint of budgeting, if you prefer to use cash (and some people find it "feels" more like spending money than cards do; there have been discussions of this and why it is on this site before), anyway, if you prefer cash, you could try an envelope method? Give yourself a certain amount for a certain category per month or per week, in an envelope (or file folder) and ONLY spend that money on that thing. Works for some people, but like all systems, only if you don't cheat! :)