I've been to three different chiropracters in three different towns, all of whom have adjusted my neck over the last 21 years and I have to say, not one of them has EVER jerked my head around or cracked my neck in ANY WAY!
I have gotten tremendous relief from spasming muscles in my upper back/shoulder/neck area over the years with nary a jerk or crack in sight. No strokes yet, either.
My current chiropractor, who I've seen for 12 years, has an AWESOME massage therapist. I love her. I often see them in tandem.
(and he's not anti-vaccination.)