Oddly enough, I've found that my harmonies generally sound better with very little effects. Maybe I'll try more reverb to see if Uncle Dave is right. He usually is!
I'm a "light" harmony user. Just enough to spice up the bridge or chorus sometimes, and generally one-above.
Wish I had the initiative to set up some elaborate backings such as Dave uses. I'm afraid I'd have to change my entire setup and use right hand to trigger the harmonies though.
What I do is working (because I am working so I probably will just continue as is.
This old dog is still capable of learning new tricks, but's he is pretty lazy and wants to just chew on the bone most of the time.