I have fond memories of this game, and a lot of what they spoke about in the interview regarding what gamers enjoyed ringed true for me. The movement of Mario did feel great, and I had a lot of fun exploring the environment, jumping in the water for swimming or seeing how Mario's movement was different in different environments. (I did notice his centre of gravity as well, and it seems like a great fit).
It is great to read that they actually had players like me in mind when they created the game. This article actually makes me want to dig up the game and play it through again.