I used to play a lot of golf, and unless required, did not use a power cart.
As I began to play less, and practice less, my ability to score began to decrease as one would expect. I also took to using a cart vs. walking.
I now realize that walking was a part of a better game (for me). Walking provided me a bit more time to consider the shot I had just made, and forget it if needed. Walking also gave me a more time to think through my next shot.
With that, I do plan on practicing more this year, with the hope of playing a bit more as well. I believe that walking when playing will also bring me back to a good feeling that I used to have when playing the game.