IMO, it depends on where you're at. Here in southern Az, open carry is pretty well accepted. It's not at all unusual to see someone carrying a gun during a trip to town. Not unusual not to, either, but it happens.
I carry openly at times, and conceal others. Just depends on where I'm going, what I'm doing, and maybe my mood that day. It's been my experience that concealed carry, while offering some advantages, is less comfortable for me than open carry. For that reason, I prefer open carry if it's acceptable with what I'm doing and where I'm going.
I try to avoid attracting attention to myself pretty much always. That said, open carry in Wally-Mart here, according to legend, apparently gets the door greeters excited. By putting on a leather vest (perfectly normal here in close proximity to Tombstone, and goes well with the western dress I prefer) I avoid the door-greeters scorn.
Two blocks away, at Fry's supermarket or Ace Hardware, open carry won't even attract a second glance.
I agree with those who say to use common sense (which sometimes isn't all that common). If I'm going into a bank, it's concealed. Common sense would dictate that action.
If in doubt, it's no big deal to conceal a firearm; at least not to me. Open carry is far more comfortable, however, and I do OC a large part of the time. It has nothing to do with politics, and nothing to do with playing big shot. I carried this way for years before concealed carry came back into legal methods of carry in most states, and I still do it today.
Concealed carry only allows me more flexibility, and the ability to carry in areas where I might have hesitated before.
Daryl