As a medical student and future doctor, I think it would be great to be able to compile a "personal list of trusted/ definitive/ reliable resources that they want the search to prioritize" and be able to search that list of websites specifically. It drastically reduces the amount of time filtering through consumer/patient information versus information pertinent to medical students/professionals.
For example, I make a search on "google" for something like "cardiac myxoma" knowing that a wikipedia results will probably show up first which I am interested in; but it is not 100% definitive/ reliable source for knowledge. This result would be followed by a series of consumer/patient resources not pertinent to someone in my position. I have to scroll down to select the results from professional/definitive authorities like "uptodate, emedicine, mdconsult, epocrates, cdc, etc." The problem is not that I can't find the results, it's that I know where to find what I need to find just that it takes too much time to search each site individually and to manually select through query results on google. In essence, I know where I want to search, it just takes too much time to search each site individually and too much time to do a general search on google (or and advanced boolean search).
I'm sure this is applicable in other ways also; many people subconsciously create a list in their minds of results that they are likely to choose in their heads before even going to a search engine but they still go to google even though they know they are most likely to look at wikipedia first for information on something, but then there is a hierarchy of other websites that they would prefer to refer to to cross-reference, compare, etc. There are times when I need to do a general search but then there are times where I am doing highly repetitive searches across the same "list" of resources.