Opposite for me. Up until a month or two ago, ATV used a different content delivery network than any of my other devices. So every time I started a stream, it would buffer for a few seconds and initiate the stream at 5,800 kbps/1080p and stay there. My other devices used the adaptive streaming and would often get stuck at or below 480p during prime time hours. Lately, Apple TV does the same thing.
So it doesn't surprise me that people are seeing reduced buffering. Since it is now adaptive, it can start the stream quickly but the quality is VCR level at first. I'm on Verizon FiOS, so I've been waiting (im)patiently for the direct peering to start since the two companies signed the agreement.