as someone who believes in creation/ID I have never been a big fan of the whole watch analogy. I, too, do not think it is very relevant. On the other hand, the evolutionist's comparison of evolution with the law of gravity is just as weak. they have virtually nothing to do with one another.
Both example are nothing more than illustrations which prove absolutely nothing.
We usually compare evolution to the THEORY of gravity, not the LAW of gravity, in order to explain why the THEORY of evolution is "only" a theory.
In case you missed it, a scientific theory explains the mechanisms of how something works. I.E. gravity is real, as is evolution. But the THEORY of gravity and evolution are different things. The theory of gravity, despite the fact that we can observe it everywhere is actually not well understood. I believe one of the current theories of gravity relates to warping of space.
The theory of evolution is quite a bit more settled science, in that we understand "survival of the fittest", and DNA mutations, etc.
The bottom line is that evolution is both a fact (because it happens), and a scientific theory. Just like gravity.