This reminds me of an oft-quoted educational
Mega-Pastors with more resources have been working the audio-visual gimmicks for years, one reason I suspect Alan's friend Eric must be a small church preacher. Still, if the goal is to transfer meaningful information in a memorable experience, and perhaps even to inspire, then why on earth would you ONLY lecture? I quickly add that gimmicks can be just as boring as anything else, but a discussion is always more likely to engage the participants on a deeper and more intimate level. So, Eric, I definitely think you're on to something.
Personally, of course, I see all this as completely apart from the myriad of other good reasons to give up traditional sermonizing. I'm just saying. ;-)