It's been dawning on me that the reason why my bike isn't fitting so well lately is because I've been trying to move my foot position. The most riding I've done, well, when I've been working hard anyhow, was offroad riding, through the mud and whatnot; and I've tended to wear work boots to do that--the step under the heel worked great to help keep my feet on the pedals. As a result, I kinda set things on my bike with the center of my foot over the center of the pedal.
Lately, since I've read a bit more about it, I've been trying to ride with the ball of my foot over the pedal; and I think that's why the bike suddenly feels strange. [That, and years of being off it.]
Just how inefficent is it to ride the way I used to ride? Is it bad from a physical standpoint? [Like, wrong seat height can mess with your knees.]