Yes, every password is unique. I just keep track of them manually using secure notes on my Mac. When something gets changed or added, I just open the note and change it. I have passwords for plenty of sites too, but there are only a small percentage that actually gets used very often. And for those sites that are important that I might visit very often, like a trading account, those passwords are remembered in my head, even though they might look like this: #3ab23&ksl78Dd7.