I used the search bar to try and see if this has been posted but I did not find anything. If it is please tell me and I will request to close it!
My friend told me about this method because he and I do arena together and we both play worgens. We were both sick of watching the transforming animation that you have to do everytime before an arena match starts if you are a worgen.
Instead of using the transform ability you simply use the "Running Wild" skill that worgens have. As a human, when you do this it looks like you slap ground and transform into a worgen. I move my toon right after he transforms (interrupting the spell), so I don't stay on all fours.
I hope this little trick helped some of you out! Thanks for taking a look