Well my experience was striking to throwing to grappling; so I can only give my experience with it.
I'd say that I will never become at good at grappling as guys that wrestled in high school and what not or who trained in BJJ for years and years. Then again my original intent on going to learn BJJ and Judo and all that was to gain an understanding of what I'd be facing as a striker, and to formulate defenses against being taken down and mangled into pretzel.
After I started learning more about grappling, I realized that knowing it gives you a far more secure feeling about fighting as a whole, because you gain skills that you can implement pretty much immedietly with a decent success rate. From that point on I decided that I would continue to learn grappling as much as possible because (1) it was fun, (2) you could go dang near full out with little injury, and (3) the value of each move is made evident later that class when you roll.
For me, learning grappling has been pretty easy...the only thing hard about it is overcoming the fact that there will be someone kicking my ass at every practice.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."