Using a password manager (which I do) is a valid coping mechanism, but does not fix the root concern: for 90% of these cases, one shouldn't even need an account. I don't want personalization. I don't want some new identity to manage. I don't want a relationship with your service. I just want to browse the goddamned web! How did we get to this point where in order to use the Internet you have to sign up for all these free accounts and generate all these ridiculous username/password combinations?

Oh, and OAuth is a similar coping mechanism. You shouldn't need to log in to something to browse the web!