It definitely does apply and you've helped me see that now. Tennis was actually the first organized sport i played, I went to an academy when I was younger for a couple of years and did fairly well in SoCal juniors. I got pwned by Sam Querrey in the first round of sectionals one year (best draw ever). But as I got older, my dad's desire to see me play football outweighed my desire for tennis. It's interesting, because I always had great feet as a DB and I think that's why I cover the widest parts of the court extremely well. A 4.46 forty will do that for you; yet it's the middle of the court where I struggle. And like you said, it's because of the lax attitude towards learning the proper footwork patterns.
People always ask me why I play so defensively, a la monfils, as I have a big serve and I'm in the stronger half of tennis players. I'm just more comfortable retrieving those wide shots, because my feet are used to moving faster, over a greater distance, taking a longer stride. Not to mention I was tiny when I was little so I had no choice, but to retrieve.
Now that I've grown into a 6'1" 175lb frame, I feel like the time has come to incorporate more offense into my game. I can do things on a tennis court most people cannot fathom, but give me a deep mid court forehand and my feet make me look like a lazy bum.
I put this up in another thread, but just to illustrate my point...
http://www.youtube.com/watch?v=b43HDEFG30k