MUCH nicer forests, very dense with grass and flowers
(forests will very rarely spawn Mooshrooms)
more shrubs and cacties in deserts
sandstone generates a bit differently
plains/feilds are a little nicer
Mushroom biomes have a lot more mushrooms (big/small)
Mushroom biomes are surrounded slightly with trees
Swamps have HEAPS of lilypads, more mushrooms, some flowers, and slightly denser fauna

The forests are BEAUTIFUL, this isn't like TNT biomes or solid diamond deserts, this adds a nice touch to the lands of minecraft, including dense, grassy forests, and a little too many lilypads in swampwaters, but dont worry there isnt too many