Yeah, some scientists consider it pseudoscience. It says in the second paragraph of the WebMD article that it is controversial.

Also from the article:

The U.S. Department of Veterans Affairs considers EMDR an especially effective treatment for people struggling with PTSD.

It is completely normal in science to „fight“ and have different opinions - so I don’t see any problems. Even if it was just (!) the Placebo effect helping a person with PTSD - why not try it?

My girlfriend was treated using EMDR and it worked absolute wonders for her. She had a very intensive treatment for a week, but after that her nightly terrors went from twice a week to maybe once a year or so.

It's important to note it's not just the eyes following a light that's important. She also had two buzzers in each hand that rumbled occasionally, and whilst recalling traumatic experiences she had to answer simple questions like "what's 14 + 7" or "name an animal that starts with the letter B". The theory is that it helps distract the brain from the actual emotion during the trauma, which helps it process the trauma as a regular memory.

If you're in doubt about this treatment, seriously give it a try and don't discount it based on the pseudoscience bit on Wikipedia.