I use Evernote both on Windows and on the Mac.
I have many many tags.
Recently I wanted to quickly see all the notes associated with a particular tag, and I was wishing that there was a way to filter the list of tags – I looked for some kind of text filter field on the tag list on the left, but it wasn’t there.
Just before I wrote an email asking Evernote to consider including this handy functionality I explored a little, and what do you know? Filtering exists.
Click on the Tags button at the top of the screen and you can filter: