If you fill out a questionaire, why wait for a human to do the Googling? Shouldn't the machine be better at it, and isn't Watson closer to this goal then ever?
No. Watson is a family of algorithms IBM uses. Not even a single machine, it's more of a brand name. And some of the impressive feats like Jeopardy are more like gimmicks than actual advanced AI.
Furthermore, actual medical training greatly favors rote memorization and application of standard operating procedures. As a computational biologist, I spend a fair amount of time thinking about probabilities and medically related topics. Over the years, I have had several frustrating conversations with doctors who refuse to consider priors or stats from well respected meta-analyses (e.g. by Cochrane reviews). But, who can blame them? Doctors have little time to think in the current system.