Yes, the old question of individual freedom vs. public good.
And I come down on the public good in this case, for the simple reason that vaccination is a non-exclusive use service that we all benefit equally from: everyone derives the same benefit from preventing epidemics of "not getting sick."
Furthermore, measles has only one natural host: people. There is no reservoir host. If you eliminate it in people, it is gone, permanently. It's one of the few diseases, like smallpox or polio, that we can actually make completely extinct through the simple, inexpensive practice of vaccination.
So yeah, I'm fine with requiring, even compelling, vaccination. Because...well, let me put it this way: no one's been compelled to get a smallpox innoculation in 40 years.