Completely agree with this actually. Cemeteries get all the attention but think about it logically - the bodies aren't really there in any meaningful sense, its just remains. Hospitals though, that's where the actual trauma happened. People died frightened, in pain, confused about what was happening to them. That kind of emotional imprint on a building has to be significant.
I've done a couple of visits to the old Highcroft site up here in Birmingham before they started converting it and the atmosphere in certain corridors was just different. Hard to describe technically but there was a distinct drop in ambient feeling, not just temperature. My mate thought I was imagining it until he started getting uncomfortable in the old ward block.
Residual haunting theory would suggest high-stress environments produce stronger imprints than peaceful ones. A cemetery is quiet by nature. An old Victorian asylum or general hospital is basically the opposite of that.
Would be curious whether anyone else has noticed this pattern or done any proper comparative research between site types.