Only track enough of the past to make your plans for the future accurate. Plan out the next N salary periods in a spreadsheet (for your sanity, keep it to less than 3 months' worth), columns for time periods and one row each for bills and other big expenditures. Group the little annoying-to-track stuff together into blobs (e.g. "entertainment budget: $50") and budget a set amount of cash for them per time period. Later I can then reflect on why I ran out of cash or why I still have a couple of twenties left over, and adjust accordingly.

This is the theory, in practice I'm a lot more haphazard about it.

The future plan does not look smooth, but that's the whole point. I get paid every fortnight, but I pay rent and bills every month. Some salaries are completely free of bills so we use those for a big grocery/clothes shop, or for saving-up to cover for a future fortnight that's going to be tight, or squirrel some away into a savings account.