While it does seem busier, I don't think it is because of Roaring Forks. All the resort restaurants seem to be busier now. We were able to get ADR's without too much hassle but some of the prime times had already been taken.
I just went the first week of March, and stayed at the ASMo. I called and got in very easily (same day) for Whispering Canyon. We had a party of 5. It was crowded and busy but still fun.