Mike, there's no hard and fast rule about how automatic you make the approach.
Personally I'll fly a raw data or visual approach without any automatics as often as possible (probably every other sector that I am PF for). Some of my colleagues never do. Sometimes I'll use the automatics to fly a visual approach which is a rarely practiced skill.
I'd say "normally", when it's vectors to an ILS, the autopilot will stay in until established on the localiser at the earliest, or until decision at the latest.