I've used Gnucash for my personal finances for 15-20 years, except for some periods (e.g. a few years where I was unemployed and depressed). It gives me great control of every cent, I know exactly what I've spent where, and I even use it to plan ahead.
I use scheduled transactions for all my fixed expenses, and Gnucash enters them 100 days in advance. I manually enter my income, usually also 3 months in advance. My income is very predictable, but can of course vary a little. I then plan out how much to transfer on payday to my debit card account, my bills account, my savings account, etc. I enter any "random" bills (variable or unexpected expenses) as they show up. This allows me to see, in Gnucash, quite exactly how much money I'll have available at any point in time the next 2-3 months.
I keep every receipt for things I buy during the week, and every Sunday I have a routine. It's become a bit overkill, but I enjoy it. First I scan the receipts with a scanner app on my phone. Then I sync the scans to my computer using Syncthing. Then I enter each transaction and link it to the scanned receipt. My hierarchy of expense accounts are reasonably detailed, I'd say.
I've gone so far as to program useful shortcuts into a numpad, to make this process even easier. So for example, instead of Ctrl-A or whatever is the default for linking a transaction to a file in Gnucash, I have one convenient button on the numpad. Other buttons select different transaction views. For a while I even had a setup where I could RDP to a docker container with Gnucash, so I could use it while at the office. For this I'd also use Syncthing to sync my gnucash data between my desktop and the container.
Is it overkill to scan every grocery receipt and whatnot? Yes. Do I need all this historical data? No, not really. But it's somewhat interesting to scroll 3 years back and look at some random dates to see what I bought and what prices were like. It's also useful for tax purposes. And I'm a bit of a data hoarder ;) (I should add that I don't always keep the receipt - I often pay with Google pay and then if it's just food or coffee or something simple like that I just keep the notification until I can enter the transaction in Gnucash.)
The biggest thing this setup gives me is great peace of mind. I've struggled with anxiety and depression, and I've lived through times where I've had credit card debt and very little income, so money has been a big stressor at times. Now I have a reasonably well paid job in IT and no debt except student loan, so I could probably live well without Gnucash, but it's still a source of mental well-being, even comfort. I enjoy my weekly routine and micro-managing my money. Sometimes I just open Gnucash to look at how well I'm doing financially (not wealthy by any means, but my net worth is at least in the positive). Gnucash was also great for planning how to pay off my credit cards.