No, but I've been to them in January and February, and I enjoyed them a LOT! Of course, I'm from Minnesota originally, and COLD is a relative term.
The first time I went to BB was in February when the hi temp was 70 (and it was WINDY, which made it feel like mid-60's or so). There were literally more CM's in the park than guests - it was me and a family of about 8 from the UK. We had the entire place to ourselves. While I wouldn't recommend the chair lift on a cool, breezy day (especially if you're already wet), I didn't have a problem staying warm, as the water is heated, and with low crowds like I experienced I spent as much time in the heated water as I did walking back up the mountain.
Now that was an unusual experience, granted, but I've also gone in January when it was very temperate, and I spent about 2 1/2 hours in the Typhoon Lagoon wavepool, which was a blast, and I never felt cold.
Again, COLD is a relative term. I shivered at TL only once in January, and that was when I dove into the chilly shark reef tank. BRRRR! But that tank is cold every day, even in August.
Jon