I would say - apply first, visit, and see what you think of the atmosphere. I don't think you're going to find many terribly terribly malignant programs, period.
For my interview lunch here I was taken out by two residents (since we have 4 sites - uni/county/private/VA - whoever is rotating at the U at the time gets to do the honours). At that time I didn't think either of them were particularly bubbly personalities.
And it so happened yesterday that some of the other residents and I were talking in the residents' room - when I mentioned who had taken me to lunch, one resident was like, "Hmm. And you STILL wanted to come here?

" And it wasn't a personal attack against those who weren't present at all.
So we have all sorts! Singles, marrieds/with kids, quiets, louds, probably evenly divided between IMGs and AMGs, with IMGs from Europe, Asia, the Americas...
I haven't been out as much as I'd like to this summer, mostly because I have neither a cellphone or a car - but hey, it's Minneapolis-St. Paul, so there's tons to do and see and eat.