"I should go sit at a coffee shop alone with my Mac and let people see me"
I know for a fact that there are people who think exactly this. And you're right, it's laughable, and embarrassing. But no different than people who wear a certain outfit or drive a certain car or bike around, or for that matter, date certain people. "I want people to see me with this!" is a very common motivator.
My laptop lasts 6 hours if just doing Word and stuff, but I have never brought it to a coffee shop.
Maybe it's the ADHD in me speaking, but I could never bring a computer to a coffee shop and actually expect to do any serious amount of work with it. There's just too much noise, too many distractions. Plus I'd feel bad for taking up a seat for too long. The only reason I would ever do this is if I was meeting with someone else.
I could certainly be wrong, as I base it on my own experience only. Notebooks from Apple are the only ones that haven't given me a bag of frustrations with arbitrary and unexplainable wifi issues.
I have had different types of problems with WiFi with both my Macs and my PCs! My Mac can never seem to stay connected to my local WiFi network at home for every long. Occasionally it will simply start disconnecting after a few minutes. Rebooting the router seems to help, so it's probably not solely my Mac's fault, but the fact is that no other device in the house (other people's laptops, a printer, my iPhone, my iPad, a NAS, a PC, my PS3, and a Sonos device) ever have these issues.
On the other hand, I can usually take my Mac to a new place and connect to their WiFi on the first try, while friends with PCs sometimes take several attempts before they can connect.