I'm a sports junky so while I don't watch more sports due to HD I have to admit it's the single greatest thing to ever happen to sports. Football, hockey, soccer, and tennis come to mind as sports that are just more enjoyable to watch on television. My biggest beef with Shaw's NFL Sunday ticket package was that only a small handful of games were shown in HD and if you cheared for a bad team like me (Raiders) you were stuck watching the majority of games in SD and it is really hard to watch once you get spoiled with HD. Thankfully Shaw has got their act together and this year all games are in HD.
I'll be honest here and while for sure some of it has something to do with now having a young family and less time but I attend a lot less Flames games than I used to and I honestly believe that the HD telecasts have a little bit to do with it.