Pretty much. I had it one shoulder and had PT (which was extremely painful). The goal for the physical therapist was to restore range of motion, mainly by pulling on it. (Did I mention painful?!). MY goal was to be rid of the pain–I truly didn’t give a rip if the range of motion ever fully returned. It took 2 years to go away. Then I had it in the other shoulder, and skipped the PT because I knew that A.) It was awful, and B.) It didn’t help. Guess what–it went away in 2 years. I have perfect range of motion in both shoulders. So, IMHO, PT for frozen shoulder is not worth the pain and cost, though it certainly has benefit for other problems.
Incidentally, my frozen shoulder(s) were a repetitive stress injury due to using a laptop computer without a desk that was the right height. After the second frozen shoulder, mine were both freezing at the same time. My doctor gave me 6 weeks of NSAIDs and said to always keep my arms dependent (down at my sides) at work. With a pull-out rolling desk for the laptop, the problem went away and never came back!