We always evacuate for Cat 2s and above, (when we lived on the levy we evacuated for every named storm) but it is very easy for us to evacuate. We have family members all over the state and have no pets. We don't have to rely on hotel availability or shelter for our pets. For many evacuation is not that easy, hotels become full fast and charge max rates and many don't take pets.
Lots of people here spend big bucks on generators and bunker down for storms, thinking that they are prepared, not us, we close the storm shutters, board and brace the doors, pick up the lawn furniture and the garbage cans, gas up and get out of dodge. Even if the storm doesn't obliterate my house, the whole town will be without power and water for days, I'd much rather be somewhere else than at my house eating potted meat and vienna sausages in the dark sweating my butt off. Thats just me.