Nikki, I totally understand where you are coming from, especially with regard to halter training. I am not an evangelist, and I do feel like if someone has something that is working for them, I think that's great. I know what works for me, and will share what I know with people who are interested. I use a variety of training techniques, but I do use the clicker work very frequently. Some people didn't like the path I chose for driving training for Flirt either, but I never felt like we were doing anything to an uncomfortable extreme, and it did work out pretty well in the end, I have to say.
Where clicker training can come in handy for halter horses in particular is teaching them to stand tied, clip, and stuff like that. I don't have to use twitches on any horse for clipping ever, but that is because I used the clicker to train them to like it.
I do use the clicker with teaching halter, because I figured out a little plan for it. And if you ever saw Mr. Alladdin "strike the pose," you would die laughing. It is so clear when he is "acting the part," he pins his ears straight forward, tilts his head "just so" and his eyes positively sparkle. It is adorable.
I really feel that Jan's clicker training videos are very comprehensive and non-intimidating. If you feel comfortable starting there, it will work out just fine. You might also want to get Alexandra's intro video, which is inexpensive and very good.