I've been in a bird hide on many occasions. As a child, we had a nature reserve just down the road from us and we went there a lot. There were several bird hides and we would sit in them, sometimes to watch the birds but sometimes to shelter from the rain!
Now we have a Wildfowl and Wetlands centre near us, which is a big favourite for a day out with my son. They have some bird hides which give an excellent view of lots of different small birds - finches, tits, sparrows.... and other wildlife like squirrels and hedgehogs. Even my four year old will sit still and quietly in there!
We went to the Mathoura Reed Beds Bird Hide just north of Echuca in September. It was our first time and we loved it. What a relaxing afternoon. I wrote about it on Weekend Notes. Over the Christmas break we went to the Baxter Wetlands Bird Hide in Wonthaggi and I got some fabulous photos of an egret with its breeding plumage blowing in the breeze. Just lovely.