I've been in therapy for 7 years, and was only truly honest about 2 years ago. The rest of the time we worked on my other issues, like emotion regulation and social anxiety though those both came from the CPTSD I'd later find out. So needless to say I never made much improvement, except for being put on so many medications that I was practically a zombie unable to feel anything for several years.
The only real dents I've made in my CPTSD in the two years that my therapist has known about my trauma are recovering specific memories I'd blocked out from my childhood. My therapist said it was good that I remembered those specific events because "without remembering there's no recovering," but I'm still waiting for the recovering part to start. It feels like I'm actually going backwards, and right now the memories are driving me crazy and my therapist hasn't been able to help.

So to put it in short, no, therapy was not all it had been hyped up to be. Granted I wasn't honest about the real problem for about 5 of the 7 years, which is probably why I've been unable to make much progress. But you'd think for the 2 years I've been doing DBT and CBT I'd be able to see at least some.