In summer, I wholeheartedly agree with the just get wet approach. I've hiked hundreds. maybe thousands, of miles with wet feet and never got a blister that I attributed to my feet being wet. It just doesn't happen, at least not to me. Same is true for most others.
When wading a lot in creeeks, you do need to be careful to keep sand and grit from grinding up your feet. If the bottom of the river is sandy, you just need to stop often enough to clean out your shoes/socks. Otherwise, march on.
In the winter though, it's a whole different story. I think this thread started with a question of how to handle this in cold weather. In that case, I'd be more careful, depending on the specific conditions.