MightyMitre, question:
You lift weights full-tilt as well as ride all-out all the time? Are you/were you ever competitive in sports? Do you take rest days?

If so, I'd add my 2 cents in that I think this is pretty normal behavior (as a competitor, a trainer, MA in counseling). We all get motivated by the rush, the challenge, the thrill, the results--they are all motivators. However, if you feel you are compulsive, feel as if your fitness routine is a ritual that you cannot pass on for one day, then...well, you need to look at some other issues and slowing down is the first one, as most everyone has mentioned.

Now, with all that was just said above, I KNOW that isn't where you/anyone are coming from whatsoever! But, I say all of this in ernest because, we've all seen someone on the road at 6 in the morning, riding/running in the dark, pouring rain, looking a bit too thin and worn around the edges...that's not just over training, that's a "problem". We've all seen it.

We talk a lot about our rides/ bodies on this forum and, that's as it should be, however, a reminder; watch out for signs that you, a riding buddy or girlfriend are way over-doing it...

I see it in the gym all the time--it's always the same 2-3 woman. All they talk about is someone "tempting" them with jelly beans (oh the horror). Their muscles are starting to look like cooked chicken falling off the bones. They always go full-bore and always talk about how much they do but never admit to how tired they appear.

So, back to the original point--if your level of fitness is "all out", then so be it; if your current level of fitness is going to create burnout so you never want to get on your bike or go to a gym again, take a week off to walk, look at the flowers/eat your favorite foods. If you know someone who, from all apperances, are overdoing/going full-bore/cooked chicken falling off the bones, perhaps ask them if they know the signs of over-training; then, leave it alone. No judgement. Taking care of you (and your bike) is #1.
Terry