If this was true, then why my art improving even though I rarely draw anything at all. There's times when I haven't been drawn in a month or a year, but I still can visually draw in my mind without having to draw physically anything.
It's kind of like image training like in Dragon Ball Z.
You have a good point there, but you need to always keep up your creativity. Even if not at your computer,here's hoping you have a grand stock of paper/sketchbooks. That way they won't escape from your mind and be lost in the cosmos. It's sort of a way of applying yourself.