"do i take it that you mean that you need to be able to quickly bring it up, draw a diagram, and then paste it into another program as an image? you dont ever need to edit it after you paste it into another program?"
Yup -that's about the size of it. Something simple and accessible. Once it's pasted it's fine as an image as more sophisticated stuff might lose editable relationships. Smartdraw has a polished genogram module -but the nifty 'add-on' I remember in one old version of Word was 'org chart' that did a similar job, but again, not flexible enough to just join up shapes you choose, how you want.
Sorry if it's too ambitious a rquest! Just one of those things you just wished you had -and to be honest, wished I had for years.