Here we come in and we hear guitar, and it's grooving to us. We feel more connected to that. The dimmed lights and darker environment helps us feel more comfortable. It helps us feel less self-conscious. It feels less choreographed.
Style is a big part of it, but it's more then that.
I would say that seeker-sensitive is changed. Seeing someone really go off on singing the 'happy' song may be very seeker-sensitive to someone who is 25. They are definitely not as distinct. There is a group of Christians now that calls themselves seekers, and there are seekers who call themselves Christians. It's hard to distinguish between the two.