The zombie apocalypse? No, an outbreak of contagious disease, civil unrest, or natural disaster that makes a crowded city more hazardous to live in. Escaping to the wild would get you away from people, in the cases where people are the hazard, such as contagious disease or scarce resources. Me personally, I just don't like crowds anyway and am more comfortable in the woods.
^^This. it's not high on my list but it's on there.
More likely for us, IMO, is the threat posed by the two nuclear reactors in our area, along with a major national highway and railway, and a tonne of industry. (I.e. I drive by the Oshawa GM plant on the way to work.) A chemical or nuclear accident are our main bug-out scenarios, other than a house fire, local gas leak, etc.
In the event of a local evacuation, we'd be looking to head out of town, and expect that many others would too. We wouldn't be heading to the hills, but plan to stay with relatives out of town. (Which direction we go depends on the prevailing winds at the time.) Being setup to camp out in the back yard could go a long way to ease the tensions that could arise in that scenario. .
I also think that there's a strong likelihood of mass panic in those scenarios. That could effect how far and how fast we can get to one of our BOLs by vehicle. I imagine every hotel and motel between here and our BOLs would either be evacuated too or sell out quickly. Being setup to camp along the way gives us more options.