Yes, I am familiar with the White Coat Investor; his site is where I first learned of this idea.
I suppose I should add some caveats to my question: I am ten years older than most new attendings (went to med school as a nontrad in my 30s), and I already have a Roth that I have been contributing to religiously for the past 18 years (I am now 39). It's nowhere near enough for me to retire on, but compared to the amount I already have in my Roth from the past two decades, $5500/yr is relatively small potatoes.
So what I would like to know is, do currently practicing attendings who earn well over the Roth contibution limit (because yes, starting in 2015 I will be unable to directly contribute to a Roth for the first time in my life), and who already have a substantial amount of money in their Roth account, still make use of this conversion? I would especially like to hear the experiences of other early middle-aged attendings who are actually doing this (or made a decision not to do this as the case may be). FWIW, my financial planner does not feel it is necessary for me to do this, although he's fine with it either way.