So I have a simple metric: Is my money (cash + investments) increasing each week?
If it is, then once every ~6 months, I take a look at my family's spending and see if there is anything we would be happy getting rid of.
If at the end of the month, the spend on each card is higher than those figures I've failed.
With modern apps for card balances, seeing if you're near your budget helps.
The alternative is to get money physically out of the bank and put it into separate envelopes and spend out of the envelopes. You'll be amazed at how your spending habits change when you have to physically hand over cash.
If you are finding that looking down a list of 50 purchases at the end of the month "takes up too much time", I would wonder how much time you spend watching TV and compare the time values. One is surely more important than the other.
So far nothing big (some things on Amazon change price by a few dollars up or down after putting in the order), but I always wince a little when I see someone not bothering at all.