Ours generally did, but these were courses upgraded from as far back as Moodle 1.5 which possibly explains the few annomalies that didn't.
My issue is the fact that if you also heve manual enrolment turned on the user has to actively seek out the enrolment link somewhere down the left hand side, rather than it just being offered to them to accept as it is when only self enrolment is on the course.
So if you have navigation open and 10 topic boxes then the enrol button isn't even visible to them, it is too far down the screen.
Two thoughts there, is our install behaving as it is meant to in terms of self enrolment with manual enrolment. If it is can we drag the enrol link out of the settings and put it at the top of the screen somewhere. Anything to make it more obvious would be good.