Yes and no. I think unfortunately, it does depend quite heavily on the people you're with.
I had 13 flatmates at the beginning of the year (one dropped out, so then there were only 12 in term 2, and another person joined us in term 3 but didn't really get to know us) and we almost all bonded more or less instantly. Within about a week or two, a group of 8 or 9 of us decided that we'd be moving in together next year. (Later became 8 because someone isn't staying at Warwick) I should probably point out that at secondary school level, I had no close friends, so this was totally unprecendented for me. 13 seems like a lot of people, but it's really not bad. We've got one international student who keeps herself to herself, the one person who left so doesn't really count, two further international students who made more friends outside of the flat than inside it, two of us who aren't that social, and the remaining people are really quite outgoing.
I think in a larger group, you're more likely to make friends because there's more of a chance you'll have something in common with someone, but it's swings and roundabouts. Also keep in mind that some international students prefer to bond with other international students rather than their flatmates. (And some home students do this too!) It seems like people in really big groups tend to separate into multiple smaller groups, which may be a good or a bad thing, depending on your perspective. Smaller flats or corridors are more tightly bonded if they get along, but less likely to actually have things in common. My friend in Bluebell likes her flatmates but just doesn't really seem to have much in common with them, so they aren't close.
Now, all I can go on is my own experiences here, and obviously it's going to vary massively depending on who you talk to, but what I've found is this. This term I've barely left my room (social anxiety and deadlines combo strikes again!
) but when I do, people are always friendly and talkative, which encourages me to come out of my shell a bit. The outgoing people tend to be out of their rooms, whereas I think quieter people tend to stay by themselves a bit more, so if I leave my room there's almost always someone out and about to talk to! Even if it's just to keep up the pretense of being more sociable than I am, I'll have a conversation with them, or go out somewhere for a coffee or a meal or something, or even do something really crazy and spontaneous (e.g. we bought a paddling pool at Tesco last term and filled it up in our common room and went paddling...
). There's no way I'd do that without encouragement, and it's definitely been good for me.
The corridor next to us is made up of mostly quiet and less sociable people, and they don't seem to talk to each other much at all, mostly keeping themselves to themselves. I know that if I was with other quiet people, I'd sit around in my underwear playing video games and never talk to anyone! I guess that really depends on how you feel about socialising, but keep in mind that with other introverted people, you have to be willing to put in more effort. I know that I really struggle with that, but maybe you're okay with it, so it's up to you. My outgoing flatmates seem to find it easy to put up with me and bond with me, but I know that even just summoning up the energy to socialise can be a nightmare from my point of view!
Not many flats or corridors seem to bond with others in my experience. Not really sure why, everyone just tends to sort of stick with the people they're with, or else make friends from their course / societies etc. But Bluebell makes it much more difficult to bond with other kitchens because of the key card system thing (we can just walk into other kitchens and say hi, they get faced with a locked door!), so in that respect you're right.
As for the type of person who puts Bluebell first, I think that just varies. Some people would just rather have a plushy room than care, some people didn't even put it down and were assigned it etc etc. I think it is true to a certain extent that you'll find more quiet people in AV, JM and Bluebell than other residences, but it just depends on how people get assigned. In general I think you find that the outgoing people are at least sort of studious, because the amount of money spent on residence means less money to spend on nights out, but then you're always going to get the people with tonnes of money or those who cut back in other ways to afford more alcohol!
I should probably also make clear that I wasn't suggesting to write that you were really social on your form, just not that you're quiet. There's a big difference. I wrote something along the lines of 'I like to socialise and see people but also like to work hard around exam time' or something to that effect.
At the end of the day, it's really up to you! Hope that sort of helps your decision and doesn't just confuse things, haha! If you have any more questions, or if I said anything you're unsure about, feel free to ask!