Vespiz, what you are feeling right now is your consciousness being forcefully expanded against your will. ^_^
Embrace that shit dude, Mulholland Drive is a special one.
But yeah, I bet if you were to show Mulholland Drive to a 10 year old and a 30 year old, ask them to write down their opinions and then compare their thoughts afterwards, the 10 year old would love it and fundamentally understand it.
Children have a far harder time understanding dream logic, the subconscious and irrationality. Not in technical terms, but fundamentally, they can feel that shit in their bones, their intuition just understands it.
Adults abandon that intuitive way of dealing with things for a more technical, twisted method of thought, while a few actively seek to maintain it, David Lynch presumably being one of them.