Sorry to bother, but why would you have such habit even when stationary and the charger is lying around?
Two reasons - One, the charger heats up a lot when I keep it on. Of course, you don't feel it unless you are nearby or touch it. Two, in the past I once had the charger destroyed due to a power surge. The Macbook remained fine after that power surge but I had to replace the charger since it stopped charging after that.
I have three of them plugged in 24/7 for 3 years now and recommended them to others, all houses still standing. But you can also get the original 96 W charger from Apple, it's bigger so it can dissipate heat better than the smaller ones.