Usages 2 and 3 are metaphorical motion (but 4 isn't, that's what distinguishes 3 and 4, but I have some doubts about that), as George Lakoff would say. However, you are right, it does not seem to include the endpoints.

It is interesting that one can say 'from A to B' or 'from B to A' but there is no way to indicate going from one point to the other while leaving the direction ambiguous. This is why oriented manifolds are an easier concept to grasp than unoriented ones (and the integers an easier concept to grasp than parity).

I'll stop now.

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman