Yes I have. It works as far as what is above ground. The problem with poison ivy and some ferns is they spread via the root system. When installing rock there will always be spaces between them. Those spaces will allow roots and vines to crawl through. If you mortar them then you also stop the flow of water/moisture, which may or may not be a good thing. I dug a trench and installed a weed /root barrier, then built a rock boarder over it. Any plants growing over it have to be trimmed.
The poison ivy will have to be poisoned as they spread very well by seed. I have to do this as family member are highly allergic to it.

I'm of the opinion that rocks outlining a border just get in the way of maintenance. Why make it difficult?
I use broadleaf weed killer in a narrow strip and mulch with woodchips. Low pressure on the sprayer works best.
Mike