Been to three different PHP/IOP between 2013-2017. I'm not a fan of these programs. They all sucked in their own ways, my biggest issue was that they fall to provide individualized care. In one program, some of the other patients were in court-mandated substance abuse treatment and were required to go to the same groups as me. Sucks to see others abused/exploited just because they got busted for weed (which is since legalized in the state that happened in.) There were also patients from a locked psych ward who came to those groups. Most of them were overly medicated and on a much different level from those who were coming voluntarily. Similarly, one of the other programs had patients who were living in a halfway/supportive living house. They also had a different set of concerns.
I've had the problem of having to use a different psychiatrist as a condition of going to these programs. One time I actually got a good doctor who followed my outpatient psychiatrist's directions and continued the same treatment. At another (for-profit) hospital, I actually reported the contracted psychiatrist to hospital staff because her poor demeanor could have easily made patients more suicidal.
I'm sure these programs help some patients, but for me they felt more like daycare that patients are sent to by outpatient providers when they get even remotely suicidal. I left 2/3 programs feeling extremely resentful of the therapy and those who referred me there, basically demanding to be discharged those times. The one program I didn't hate, I liked because I actually had access to a good psychiatrist weekly & the therapy content wasn't the worst & they had free catered lunch every day which made up for not having parking.
In each program, there was at least one memorable patient who either overshared or monopolized group therapy time. Whereas quiet people like me barely spoke at all in some groups. It's clear that these programs are a way for hospitals to make money. Insurers will generally pay for them & they won't take patients who can't pay & there is no real consequence for the institution if the treatment is ineffective/harmful. There are always more patients to be fed in from therapists & psych wards.
OP, I hope you find something that works for you.