Jim Dale is really a phenomenal narrator. In addition to having a gazillion voices to remember how to portray, he makes each of them memorable and constantly evolving along with the character's story arc. The Harry we see (and listen to) here - aged 14, with the beginnings of adolescent fears and insecurities - is not the naive 11-year-old of the first book. The narration makes that clear: Harry sounds older, more jaded and - by the end of the novel - frustrated with how people perceive him. Voldemort, too, experiences a shift in tone, gaining in substance as his own body becomes stronger and more independent.
As with the previous novels, I'm catching details that I now know will become important later on in the series. This is, along with the sheer pleasure of it, a great motivator for revisiting the series. It probably won't be the last re-read/re-listen either. On to the next book!