I have been using RVParkreviews for years and really like that site, but for some reason people don't seem to review state parks all that much... at least in New England. I have found many great state parks that are not reviewed, by carefully looking over the state's camping information.
In Connecticut most state parks don't have hookups, and those that do are usually a limited amount. If you have a medical need for electricity, many state parks have some sites with electric held late for that - they hold them until late afternoonish, then the sites are available for whoever.
And YES, it is much more expensive per night up here than in other places!