I have an application that is basically a directory of sorts. I need certain information filled out. A form allows me to mandate that I get that information. A more full-featured interface, even one as easy as WordPress, would also require training, and my end users are strewn all over the state of California.
The form-to-email route is so close to perfect that I an just taste it. All it needs is the ability to post to draft instead of publishing immediately.