Or just generate random 15+ character passwords for admin accounts. From the article it appears the concern is from brute forcing "admin" account passwords. Good luck bruting MT#r!}A1(hIQ4^pC*7`K.KGiL\&[A\k#TUC4R<R?
I dont think it's practical to rely on memory for passwords anymore. If it's a site you really couldnt give a damn about, then sure, as long as you're okay with whatever information you submit being potentially linked to that password and to any other information.
I just use a text file on my computers desktop and a usb thumb drive. I don't note what the password is for. So my Amazon password is something like dkwjRw#4camzR4%7hjfgdelsdshWE