Management summary: ask and watch the response closely.
Long version:
I do pretty much insist (in a polite fashion) on meeting my future teammates if I go on an interview and it progresses to the more advanced face-to-face interviews. Human interaction is a funny thing and developers aren't exactly ego-less so any hiring manager worth her or his weight will almost forcibly introduce you to the other team members first to see if there are obvious incompatibilities.
As someone who has been a team lead/manager at various points in his career, I would be a little suspicious if a candidate didn't want to meet with the rest of the team at some point during the interview process. This immediately suggests that they either don't care much about where and with whom they work - never a good sign - or that they are so disinterested in the social interaction that goes with working in a team that there's a problem waiting to happen. Of course, both suspicions can be completely wrong but you have to keep in mind that hiring is a process of elimination and if I am lacking any positive indicators I must assume that their absence is a negative. This might not be fair to the person being interviewed but I can't get into your skull and see what's inside. Well, not legally at least.
In fact, the best hiring results I have seen (but also the longest hiring process this side of Google) was with teams where every member was part of the interview process so everybody got to talk to the candidate. This will draw out the hiring process as you get more people vetoing candidates but on the other hand, if they feel they can't work with them in the first place, you're not doing anybody a favour by forcing them on the team.
Any hiring manager who tries to keep you away from their team is either more worried that you'll poach his developers (why? Is it that crap a place to work for) or has something to hide. In my experience it's likely to be the latter, which is why I never take this a as good sign. One time when I couldn't meet the rest of the team because they "were in a different location", it turned out that this wasn't the only reason that I shouldn't meet them before signing on the dotted line.
Always keep in mind that you'll spend at least as much time with your coworker as you do with your significant other/family, so be choosy in a way you can't always be with family.