Fresh parsley does makes a diffrence in cooking..see these video recipes I' ve done that feature fresh parsley.
http://www2.harvesteating.com/recipe-list.cfm?SearchRecipes=parsley&Submit=Search+Recipes
Keep in mind these are all made with Italian flat Leaf parsley..not hte curly stuff which is never in my kitchen. Parsley has a grass-like flavor which adds flavors to dishes for certain.
A good place to experiment is with compound butter: 2 sticks of organic butter at room temp, add in 2 cloves roasted garlic, a touch of salt, 2 tbs minced fresh parsley..mix well. Then roll in parchment paper into a log shape and freeze. Then use it for pasta, garlic bread, on top of steak, grilled fish..uses are endless.
Hope this helps!
Chef Keith Snow
http://www.harvesteating.com