I don't know how it fits into the food truck discussion, but I think there's a broad point to be made: people like to be outside. At the very least, they like the option. That's why "artisanal" food trucks seem, to me, to be missing the forest for the trees. I'm sure you're 100% organic-casing, farm-raised veal sausage on rye with my choice of lavender honey from Provence or specially-made Silesian mustard is fucking delicious - but I (and hey I could way off the communal opinion this), would eat at a food truck because it's simple and I want to sit outside. Not because I need to quench a Baluchistani meatball fix.
Chilling out and about is the overarching reason behind food trucks success - that and good food, granted. I'm on the tail-end of sometime up in Scandinavia - the absolute, no questions asked hardest adjustment to make coming back is that I can't grab a road beer and walk to a friend's house. Ok, well I do do that, but I want to do it legally. No there's no chance of that happening - not the least of which is the issue of how to deal with trash*, but man there's just something so.....tempting about bringing a six pack to the waterfront or Cambridge Common.
There was a point in the Kendall thread (if I recall correctly), that brought up the point about how green space is comparatively underutilized - and that's a point that I've been thinking about over here as summer rolls around. The parks and canals ringing the old city (really any open space in the city) are packed to the gills, and not with tourists or their ilk. It's just full with people, more often than not sitting down having a beer. Simple stuff. The heavily trafficked parks are old, they aren't designed to be inviting (the biggest one actually has a two meter high fence around with only a few gateways as it's the former grounds of the Royal Palace). I'd venture that people respond to these open spaces in greater parts to what they're allowed to do there, not how they're designed. I think that's what's underpinning the food truck mania - offers a whole new way to enjoy Boston without having to lug a lunch around all day or fight for a patio seat at a cafe.
* so there's an interesting way that Copenhagen deals with the inevitable open-carry trash, cans have a redemption value of 1dkk, about 15-20 cents. That's just enough money whereby people can scavenge cans and make a semi-decent, tax-free profit. This informal system is so well developed that's it's started to actually draw ire from human rights groups in Denmark as there, let's just say shady, groups that control various 'picking' turfs around the city. The Roma have the interior canals, the Senegalese have a few parks, the Chinese have the major tourist canal - a lot of the pickers are probably trafficked to Denmark, and very likely exploited so it's not a system I'd suggest we emulate. But it is interesting that there's informal process that developed organically responding to this certain need. To be honest, the reason people put up with it is...well it keeps the city clean. You'll see kids playing a game where they throw a can on to the ground and bet on how long it takes to be picked - first time I tried, I thought 5 minutes, can was gone in 20 seconds. It's sorta remarkable, if sordid. Anyways, nothing to do with Boston, but I thought an interesting urban/sociological system