For what it's worth, Kaspersky Internet Security (among other of their offerings) includes a password locker that keeps your passwords for you and applies them at appropriate times. To activate it, you need a password that opens the "password safe" and if you lose that, you have lost your passwords. I thought about that and decided to not enable it. The security risk is low but the practical risk is high. I'm old enough that if my memory DOES start to go, I'll get very frustrated. Since Alzheimer's runs in my family (four known cases and two suspect cases on Mom's side), I will not risk losing all of my passwords because I lost one password.
Personal choice, not guaranteed to apply to all of you younger whippersnappers.