Hmm. I don't know what you mean by "HP". The Wizarding World of Harry Potter (WWoHP) is equivalent to a land at WDW, and contains multiple rides. The main ride and big draw is Harry Potter and the Forbidden Journey (FJ), which does not accept the Express pass. The Ollivander's Wand Shop is another attraction in WWoHP which does not accept Express. The other two attractions within WWoHP are Dragon Challenge and Flight of the Hippogriff and do accept Express.
Outside of WWoHP, the only other two attractions which do not accept Express are Pteranadon Flyers (also at Islands of Adventure) and Hollywood Rip Ride Rockit (next door at Universal Studios--a separate park).