During a standard 3-week tour of Sri Lanka you're likely to visit almost all of the country's WHS: it's just not that big. This new addition to the WH list is no exception: Adam's Peak for example (at the heart of the Peak Wilderness Sanctuary) is quite a landmark.
In 1996 we travelled to the center of Sri Lanka by train. There are many tea plantations in this area. As you go uphill, it gets colder and wetter. As the temperature only reached 15 degrees Celsius, we felt like we were in England or Holland. The locals were really cold too and wore thick jackets, fleece sweaters and hats.
From Nuwara Eliya we did a hiking tour at the Horton Plains. We were transported to the park entrance in about an hour and then walked for about 4 hours. The things to see are some steep cliffs (Little World's End and Big World's End) and waterfalls.
My trip diary notes do not mention anything very remarkable about this hike, and I must admit that even less is left in my memory.