Part of me says 'just ride -- if you don't have a destination you can't get lost' while another part says 'maps are neat'. How to reconcile? One possibility: enjoy the map... then ignore it.
Anyway, I found an incredible cycling resource for the Netherlands... a interactive site offering cycling-specific maps based on the LF (longfiets, or long-distance cycling) network, for variety of routes and regions. Here is the site: Landelijkefietsroutes
Purchased a set of overview maps -- the "Basis Kaart".
Very nice maps, and they appear easy to ignore in a pinch.