I love my pond!!! I have koi in there that is over 2 and a half foot long. They come up and eat out your hand and let you pet them. If it is done right it really makes a back yard and is good for your pressure and so relaxing.
I think that having ponds or birdbaths in a yard really make it beautiful. Plus the sound of gently running water is just so inviting and relaxing.
I dont have room in my yard for a pond, but I do have a tall fountain that we use. The sound of the running water just makes it so peaceful and relaxing to sit outside and enjoy a good book or just to watch the day go by.