When I worked with hospitals that were hiring entry-level candidates, and i was helping with the recruitment process, what I observed was that nursing managers and directors wanted people with past experience, such as your super-user experience, etc.
We did see some people with certifications in their resumes, but as somebody said, "this doesn't tell me anything" (in terms of what the person can do.)
Obviously, there are thousands of employers out there and this was just what I experienced in a couple of hospitals, but maybe the certificate would be of help if the place that is offering partners with an employer, so that when you finish your program, you can interview for a job, or the place that offered the training, will help you find a job.
I think there are some places that do that, but at least from what I've been told from those who do these certificates is that they felt abandoned and that yes, the certificate didn't really help much with getting a job. Again, I suppose that's because these individuals didn't have prior informatics experience, but maybe there are those out there who benefited from these certificates.
I personally advise people just to get involved in informatics and apply for jobs. That's how many of us got in the field, and that's how some others continue to get in the field.
If the place you're planning on getting this HITECH trainer program from will help you with the job search, then I would think is at least worth it to try. If they say that you're on your own, then maybe it might not be such a good idea as you can really get a job on your own, given your past experience with informatics projects. That's my opinion at least, but I'm biased because I personally didn't see candidates getting any advantage from having these certificates, but like i said before, in all fairness, this is based on what I saw in a couple of hospitals.