I must confess that I enjoyed the remake, which I saw first, ignoring back then about the original 1979 movie. But I have to agree with you about the original should have focussed mainly on Carol Kane's character. It would have been just 1.000 times better and way more entertaining, as she's such a terrific actress and the atmosphere inside that house was just perfect in order to expand the suspense for much longer.
Even though the stalking to the other woman by the killer was somewhat disturbing, like you said, it would have been just great for them to take that direction and expand it in a deeper way... but for another movie. I wouldn't have minded at all had this movie lasted only one hour or so had it been focused on Carol's character only; the middle part gives just too much information on the killer's day after day and such, which we just don't need to know much about, spoiling the mystery. It's always much more frightening to ignore who he really is or what he really wants (well, at least for me ).
A great film though; the scene when she's finally running away from the house and Charles Durning's face suddenly appears, making you think that he's the bad guy instead of the police, as well as the ending, when she finds out that the killer was laying down next to her, were just terrific and very well filmed, and still give me goose bumps when I think about them!
Animal crackers in my soup
Monkeys and rabbits loop the loop