Well worth it, once you become adept at navigation it opens up the world to you - the uncertainty you feel when you're off the recognised track is replaced by knowing your location and being comfortable travelling away from crowds, off paths and when you are at an advanced level this should mean regardless of weather or at night time. Now I'm not saying you should be out by head torch every weekend, but it's freeing to know that you could be.
Looking at the National Navigation Awards, Bronze is broken down to map setting, basic timing/pacing and route planning, contour basics, basic decision making and using a confirmation bearing to match your map. It seems more about being aware of your surroundings and how it relates to the features on the map, ticking off features/catchment features. If that is what you're interested in then absolutely go for it.
If you find yourself out in 'open ground', that is to say areas of remote hilly countryside then I'd suggest the silver award might open the door to you getting out to different places since they introduce walking on bearings and start using navigation by contour features - which is in my opinion the difference between being comfortable on a particular path and allowing yourself to go cross country. However if you aren't interested in that then fair enough.
You also might want to look at 'Navigation' published by Cicerone Press, it's likely a lot cheaper and after reading it a couple of times + applying those techniques your confidence should shoot right up.