This is also my new favorite Android feature. It also enables translation. It even works for non-left-to-right languages, e.g. vertically written Japanese. The only downside is its tendency to immediately search for whatever you've selected, dumping all sorts of nonsense into my search history.

I do like when an accessibility feature is a hammer one can use against web designers who've disabled other features. The next one I want is "zoom non-zoomable web pages and apps".