One thing to note is that over several seasons and 40,000 miles, what degradation there is happens at a snail's pace, so you may not have noticed the change. In a perfect world, you could ride someone else's braided-line-equipped FJR back-to-back, and see if there's a difference. Perhaps the FJR's stock lines are stout enough to last longer than others. I don't know, myself. I do know that when I change brake fluid this fall, I will be putting in SpeedBleeders and stainless braided lines.
On my 98 SuperHawk, I had replaced the lines after 3 or 4 seasons of riding, and the improvement was very noticeable. I know it's not apples-to-apples, but it made a huge difference on my Honda. More power and better feel. I had installed SpeedBleeders too, and when my riding buddies saw how easy a brake bleeding was with them, they all bought sets for themselves. Great product, and cheap, to boot.
Just another opinion. Take with a huge grain of salt.