I consider 2 houses my first. one was Screamhouse Resurrection in 2006 (sweet 16). I went through that house 3 times. The first time with the my eyes closed, second time with my eyes open for half the house and then the third time for the whole house. I can't recall much of it because of being such a wimp.
Yeah, I was a wimp for my first HHN but got a lot better when I went in 2008. The second and one I remember the most was Scary Tales: Once upon a nightmare! This house I remember walking through Rapunzel's hair as she is dead at the top of the tower, Cinderella's foot cut off and her ankle bleeding, and the hallway of mirrors.
While Screamhouse was my first actual house, I recall more of the first house I went to when I returned to HHN.