Misery, thanks 
I personally think that while clicker training is great for teaching a dog tricks, it is over-used to the exclusion of other important learning tools. Dogs are one of the few animals that can read our expressions, and one way to build a bond with our pet is to make them focus on us and our subtle instructions through our body language. It helps them bond with us in a more meaningful way.
I think, in part, why trainers are so pleased to use clicker for all problems, is that it is the only tool they have, as they don't have a bond with a dog they have just met. Similar to the other extreme of using shock collars or whatever.
For example, I was teaching my girl to walk to heel. She is a sheepdog and loves to run forward and look back and ask, 'where are we going'? It is good as she is focused on slight moves of my head to tell her where we are going. But sometimes, i do want her to walk to heel.
If I had gone to a trainer, they would have probably used a clicker. Or a bad trainer would have used a prong collar or something. I did it through having my dog off-leash for a walk to the park where we play ball. If she ran ahead, I stopped and very slightly snapped my fingers. She would look at me and automatically trot back and sit. Then I would start to walk again, without saying anything and she would walk with me, till something interesting smell ahead made her run forward and I would stop and repeat. This went on till we reached the start of the park. She ran ahead and I stopped, and she didn't return. She looked at me and with a stubborn expression indicating 'I am staying here, I want to play ball'. I just turned back, said nothing and walked home. I was nearly home before the stubborn girl ran back after me. We started again, and she walked perfectly to heel. And we had a great session of ball chasing.
The point is through this method she learned that she needs to listen to me, even when the gratification is a long way off. It is teaching her discipline and now with just a slight snap of my fingers I can get her to walk to heel.
The thing is, only an owner can do this. If a random trainer came to my dog and started walking and stopped. My dog would be off doing her own thing, wouldn't bother to come back to the trainer without a sweet or some form of instant gratification. A trainer needs to make themselves exciting to the dog. An owner, well, not really. My dog wants to hang out with me, she feels safe, it is fun and it reinforces that we are one family unit which makes both of us bond more.
So the long and sort of what I am saying is that I think that dogs are very resilient and don't need constant praise to learn. Nor does a correction make them nervous or resent the owner (note I am not talking about prong collars and electrical shocks). I see my dog with the pups and she really is quite rough, and sometimes I just stop her as I am
. She is a loving mum, but she bites them on their ear and leg and they squeal and run to hide under the sofa. And most of the time the poor buggers have done nothing at all to warrant this! She also has no qualms taking away her favorite toy from them and the puppies look a bit
and then in a minute
and continue playing with something else. And they still come running excitedly to their mama the next time she comes around.