As a trainer, I really do preach the rest week, as your body does really need the rest even if you don't feel you do. This helps you keep from a physical plateu as well as a weight one, if you need to lose a pound or two.
But recovery week is something even gold medalist take, as they know you can only push so much for so long and then your going to crash if you don't take a break. Also when you take a rest week, you are actually tricking your body. You slow down, it goes an starts mending any type of stress you've done to various parts of your body and since your on rest week it's not a constant battle with you, as your aren't stressing these muscles as much so it can gain a lot of ground. This when you come back full swing after that week your ready to push it to the max, and you can, and most of the time everyone I've trained does better that next week. There are a few who didn't but they didn't excatly follow rest week. As they decided rest week should be laying in bed, not getting up and doing things.
As one thing I've found is rest week can really be a re-energizer, no matter if your tried from working out, or life, with the lighter workouts of rest week and all the stretching, I usually put into it, it seems to re-energize people and especially myself and then the next week your bouncing around full of life and energy and ready for the hardest workout anyone can throw at you.
But seriously take one about every month and try it for a couple months and see how it feels, as it will improve your workouts if you do a rest week correctly and don't just go flop in bed the whole week.
Kit