If you can swing the 2-bedroom, I'd go for it. You can see pictures on allears.net. I think most one bedroom only have a king in the bedroom, then a sofa bed.
I have never found the resorts to feel crowded, even during busy times (never stayed at BC, but OKW & SSR). IMO you cant beat staying onsite. I much prefer the buses to driving and think in most cases quicker and more convenient. And the FP advantage will be a key part of getting on the rides you want. In the past I have used Touring Plans and other crowd calendars to pick which park to go to, and I find it helpful.
I have always wanted to stay at BC. It's a beautiful resort and great location.