There's definitely research that shows more resolution and screen real estate are helpful for productivity. And, of course, more of our work does happen on screen now than in the 70s.

Still, I'm personally happier with more desk space. We still use paper all the time. Tufte points out in one of his books that humans are better at spatial comparisons than time-based comparisons, hence his fetish for data density, and mine for lots of screen and desk real estate.