To each their own. Like I said earlier, if it is something really substantial (like several days long) or leads to some kind of certification, it might be worth listing. An example I could think of is special training in a type of intervention (e.g., EMDR) originating from whoever developed the intervention to promote fidelity of implementation.
I wouldn't read a CV line like that as bad. I would view people listing short workshops that they attended as padding. A good example of this is the AACN conference. They have lots of awesome half day workshops on neuropsychology related topics that an be used for CEUs. They are great workshops, but if I saw someone list attending one on their CV, I wouldn't view it favorably.
I could see your reasoning about wanting to show some DBT experience. But I would be concerned if you were listing something that didn't reflect formal training (e.g., saw a grand rounds on it or attended a 2-3 hour informational session on it). As mentioned earlier in the thread, too, these really won't matter as you get further along in your career. Perhaps it wouldn't hurt for your internship applications - but eventually people will want to know that you actually trained at a site known for DBT, not that you attended some workshop on it during graduate school. My friends who were into DBT did practica that were DBT focused and that helped them get DBT internships.
I could see a scenario where someone is a clinician, does not do any publishing or research presentations, and starts catologing all of their CEU workshops to show that they are actually doing something other than their job. But some people (like me) would just view that as someone doing what they are supposed to be doing, and probably taking too much credit on their CV. Once again, to each their own. List at your own discretion.