There are quite a few vertical solution applications that will not run on limited accounts. I work with optometrists, physicians, dentists, and chiropractors... and so far I have found most of the popular medical practice packages for small offices will not run in a limited account, insisting on full administrator mode. This leads to problems with successful attacks on their systems by viruses, ad-ware and spyware.
We have several medical facilities on the slate for 1Q, so I'll keep an eye out for that sort of thing. HIPPA should be bringing that practice to a close though. I've seen a few of the programs that you are referring to in my Sys Admin days making calls to doctors offices and such, and judging by the amateurish quality that I witnessed, I don't doubt what you say at all. Most of my experience has been with large Enterprise type programs, and had they required administrator access to operate they never would have made it past a cursory look.