The primary danger would be that you add sensitive information, forgetting that the account is weakly protected. I've found that having a password manager comp

The primary danger would be that you add sensitive information, forgetting that the account is weakly protected. I've found that having a password manager compels me to have a strong password for every single site. Not having to remember anything (is this a weak password site? Did they require a number or capital?) is such a relief, and knowing that the account is as strongly protected as it can be (with respect to my control over the situation) is quite comforting.