I've never heard one use it. Partly since the JD is reasonably new and is merely a change in the title not the education. You still do more or less the same work you did when the degree was LLB. Same is true for Pharmacists. They used to get a degree in Pharmacy now they get a Pharm D degree but they don't call themselves DR. If you are an MD or a Ph.D you are a Dr, otherwise, I wouldn't use the honorific.