I havent actually voted, because I think it should vary depending on the style of song, whats going on and the type/style of the service, who the congregation are etc.
For example, in a youth event, at our church we will get in some intelligent lights (and a trusty Fat Frog!!) and treat it like more of a concert thing, however when its the main speech we will go to a preset.
The lights on the congregation will remain on, but at a low level unless requested other wise.
A normal service we will just stick with the in house rig (a load of pars) and do a basic wash over stage. The congregation lights will remain on, but at a higher level for people wanting to read etc.
The main rule however that I use, is that the lighting is there to compliment the goings on, to build on the atmosphere and as in all ministrys, help bring people closer to God. And it shouldn't be a distraction!
Just my £0.02!!
Chris