I use it all day (maybe 8 hours a day), but I move around a lot. Whenever I'm not typing or reading on the screen (thinking), I walk around. That helps a lot. I sometimes go sit down a bit in other rooms, but basically I can stand all day if I have to.
It took my about 3 weeks to get to that point. For the first few weeks, my feet hurt a lot. But at some point I passed a threshold and it pretty much stopped hurting altogether as long as I can walk around and shift my weight from one leg to the other a lot (I couldn't stand still all day).
I am not Mike. But I use a standing desk. It took me a few weeks to get fully adopted, but now I can stand (or move in place) for several hours, if necessary. Usually I take short breaks though.
And actually, the ability to take short breaks and walk around is something I really cherish. Removing the (small) barrier of needing to get up has really helped.
But you can not read too much into my experience report with the standing desk: I took up weightlifting at the same time I got my standing desk, and so it's hard for me to say which change was responsible for which improvement.
It's not an app... it's like the notification tray. You can't simply 'take' the notification tray from one OS to another. Same with this. It comes with Jelly Bean.
As I mentioned in a comment earlier this week: to many people, Facebook is the default communication medium for a large number of people. You can bet your ass it would matter! There are many sources of news that people can reach to. But people tend to stick to only a handful of communication mediums. Could you imagine if 'email' shut down tomorrow?
Didn't say it wouldn't matter. The NYT isn't a vehicle for conveying news. That aspect of what they do is replaceable. They are, moreso, a discoverer of news, and also an editor of both news and culture. I both roles, they are incredibly influential per my other comments.
