I must admit I sure do love the way a polarizing filter makes the sky and clouds look. It does a great job of blocking the reflections on leaves, rocks, etc. A good polarizing filter can make your photo look great with little additional work on your part.
Now for the downside of polarizing filters. If you use a wide format lens or intend to shoot any sort of HDR or exposure set to combine you may want to not use a polarizing filter. Using a polarizing filter for shots and then combining them later can show significant color banding. On wide format lenses one side of the shot may be much darker than the other side. i
I love to use a polarizing filter when I can, just be sure to review your images before you leave the field. You don' want to be disappointed when you get home.