Bears are more curious when they are sniffing around your camp. We used the electric fence in the Cold Bay area and it worked great. The big bears would come around and they would sniff the wires & realized it wasn't for them.
I think the biggest difference between bears in AK & the lower 48 is bears are hunted in Alaska and not down here. The bears down here do not see us as much of threat as they do up in AK. They still are dangerous in AK but they know they can get their butt shot off. WY, MT etc the bears haven't experience a "bear hunter" and have no fear of humans.
We have had bears come around camp at night trying to steal our moose meat but only 2 have made it out alive. And it was the older willy bears that made it. The younger more desperate bears in my experience are the ones that are bold.
Make no mistake they are FAST, powerful, silent, and temperamental. A big 9' bear will sneak in on you and will never know until he wants you to know. And then it could be too late. As you probably have read stories or heard them while guys are gutting or packing out animals and BAM there is a griz.
Probably the most hair raising experience was cleaning moose in tight timber w/ my son. He was 13 and he is suppose to watch, listen, and notify me if anything & I mean anything seemed out of place. I ain't going to lie I was nervous the whole time I was working on that moose.
I will say this, hunting in griz country is exhilarating ! Your senses really come alive . Your life depends on those senses. You will NOT wonder aimlessly through the woods knowing there is something out there that can eat ya ..
So inclusion we have had bear fences work, I know of guys that say the fence works, but we all still slept w/ a gun.