If we didn't have a two-party nightmare willing to filibuster perfectly good policies as a tool to ramrod in alternative agendas, I think it'd work well to have laws with expiration dates. You'd have a natural forcing function by which language would be refined over time, laws would stay relevant, and the total body of legislation would stay at a manageable size.
As something of a litmus test, if a crime is so minor that the police wouldn't do anything if you brought them multiple eyewitnesses, video evidence, and an address to knock on, then having that law on the books probably does more harm than good (many petty crimes like mild speeding would fit those criteria).