I’ve been using Evernote’s Mobile web interface (https://evernote.com/m/) to take notes quickly on desktop PCs. I find the full Evernote interface (desktop client or web) a too distracting if all I want to do is make some plain text notes without reviewing what’s already there.
(NB: On Ubuntu I found Firefox gave me an XML error when visiting the mobile site, whereas Chrome worked fine. I don’t know if this is the same on Windows/other operating systems.)