Exactly! When I tell people that haven't watched or have never heard of Twin Peaks I usually tell them there are two layers to the story. The basic murder mystery layer and the coded other worldly layer; usually that gets them interested enough to check it out....I also recommend that they see one of David's movies too just so they get a sense of it.
But yeah, season 2 second half was weaksauce and probably for the reasons you mentioned.
Season 1 sticks with you.
Season 2, the main plot revelations are the only things that stuck.
That and James random side story > Oh and Billy Zane being a love interest for Audrey. >
I hope this current season keeps its pace and doesn't go off on other things.
I hope we also hear more music because Laura's theme and the jazz theme were really drilled into you with the first seasons. :D