I live in the San Francisco Bay Area. I just re-watched The Pirate Planet this evening. And I have a season 12 scarf. So, yes, I'd call myself a Doctor Who fan.
Doctor Who developed a fairly sizable following in the US. In fact, there's a Doctor Who-themed convention coming up in Los Angeles on 18 February -- Gallifrey One [http://www.gallifreyone.com/].
As for the New Who, Smith is too new for me to form a reasonable opinion. I think he's a decent actor, but there's something uneven about his tenure so far; can't quite articulate it. Tennant, on the other hand, I very much liked.