Definitely go. We went last November, and my older two (both HP obsessed) loved it so much. I'm a HP fan too, and I thought it was amazing! We went two days and got there when the park opened and had zero issues riding the popular rides multiple times. We stayed offsite (also went to Disney). Two days is plenty. You need the park hopper (or whatever they call it) so you can travel on the hog warts express...be sure to take it both ways since it's different each way.
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DD (3/06)
DS1 (7/09)
DS2 (8/13)