[simonbyrne]

Also, many people use it only intermittently, maybe once every six months or so when they have some data to look at. Rather than try to relearn the language and its quirks yet again, it's much easier to take what you did last time and tweak it until you get what you need.

[Fomite]

This too. Between collecting data, writing grant proposals, writing papers, etc. I don't spend time day-in, day-out using R.

Often the first hour of that is thinking "Shit, how do I do that again? Has Hadley written a package to do this better by now? What did I do last time - why did I do that last time?"