Yeah, I recently changed my main dev environment to be a 27" 2560x1440 monitor (Asus PB278, if anyone's curious) attached to a Mac Mini. There's enough space to happily keep a browser, evernote, and a terminal side-by-side (three vertical pillars); this has had very noticeable impacts on, if not my efficiency, at least my feeling of "not having to context switch". Everything's just right there and I just need to shift my eyes left and right.