It's all about emotions and how we express them. I don't think exhibiting a little bit of celebration is any more disrespectful to the animal than it would be for someone to not show any emotion and simply get down and go get their deer. We all express emotions differently in different situations. Hell, my old neighbor is a pretty laid back guy, but when his football team is playing, I could hear him from his house to mine...he really got into it.
I personally don't hoop and hollar, but I do get very, very excited when I make a good shot on a deer. I get pretty excited even when I don't get a shot. Yesterday afternoon I saw a nice 8 Point (no shot) and went home and told the LOML all about it...and I was excited. Matter of fact...talking about this has meexcited so I'm going hunting now and hope to have pictures to post later on.