Yeah, agree. Depends what you mean by laid back. Most of these people are probably gunners who have a distorted definition of "laid back", because they've been gunners all their life. These programs are likely still very far from what you would consider 'laid back'. I would try and figure out how many research projects everyone does (from posters and case reports to retrospective projects). The number of projects everyone does is an indicator of the pressure put on the residents to work during their free time. The more projects, the less laid back the program is. Remember, research projects = time working outside of hospital (cutting into learning time and free time). You can't tell by how the residents act, because they are all self-selected... probably all love the same gunnerish activities (i.e. working 8am - 5pm at the hospital followed by working at home until bed... only to wake up saturday morning at 8am and work until dark on hospital related activities). Just because they are happy or seem relaxed doesn't mean you will be happy or relaxed.
The only truly laid back programs are going to be community programs (filled and run by people with less gunnerish personalities). All the other programs are run by former gunners who promote that same environment: competitive work environment with a majority of work done by residents with a large emphasis on research projects (i.e. enforced work outside of hospital). The community program I rotated through as a med student was so much more laid back... unfortunately there is real and large trade-off in terms education between community and more academic programs that I'm not sure it justifies the more laid-back atmosphere.
Before you can talk about "laid back", you must define it. To these people, "laid back" likely means doing some thing not related to work a couple times per month (or spending 10x the time on work than pleasure). To others (particularly outside of medicine), "laid back" would mean not doing anything related to work outside of work and having a separate life (or perhaps more reasonably a 50:50 split in medicine between work and leisure).