The long queues were only because people on both sides weren't signing up. They've lowered the starting number threshold, though, so games will start much quicker. Also, it definitely helps to be Horde on most servers if you want to play BGs.
Arathi Basin are the fastest and always seems to have lots of people playing in them. Once you're level 60, that is. Lowbie PvP blows.
I haven't waited longer than 5 minutes for an AB match. Usually it tells me I can enter in about 10 seconds.