I've been here for 8, my (totally anecdotal) observation is that a lot of the homelessness + drug use has moved up market from the mid market/tenderloin area towards duboce triangle and the castro making it more noticeable/visible. I wouldn't be surprised if the absolute numbers increased too but it seems like a lot of the development/companies that moved into the mid market area may have led to an increase in police enforcement that has led to a dispersion.
