It is my understanding that a browser extension/plug-in basically can see all of your traffic and everything you do in the browser all the time, regardless of which site you're accessing, while a bookmarklet is passive and only does something when you click it.
So, yes, I want a bookmarklet.
And, yes, copy-paste is what I do now. ctrl-T to open a new tab, click on the address bar, type in "ever" TAB, W A I T for Evernote to load, click on "new note", click on the tab containing the original link I want to store, click on the address bar to select the url, hit ctrl-c to copy, click on the tab containing Evernote, click in the note text area, hit ctrl-V to paste, click on the note title area, either type in a title manually or click back to the tab containing the original page I wanted to save (and click-drag ctrl-c to copy the headline, click back to the evernote tab, click in the title area, hit ctrl-v).
I'd prefer a bookmarklet.