I also grew up watching the B's in the 70's, though it was the late 70's, so I missed the Orr years and their last Cup victory. But I have fond memories of watching Rick Middleton, Mike Milbury, Stan Jonathan and Terry O'Reilly on the tv. I've never had cable, so once the tv coverage migrated from Channel 38 to NESN, I pretty much stopped following them. The Sox I could still get on radio, the Patriots were still on free tv, and I never really followed the Celtics too closely anyway. I tried to listen to the radio broadcasts but it just didn't work for me - baseball is perfect for radio, football works well enough, but with hockey I could never capture a mental image of what was being described (basketball is even worse for me, but then I still don't know what "The Lane" refers to).
Between the lack of tv and the destruction wrought upon the franchise by Sinden and his ilk, it's been hard for me to keep up my interest over the years. I check the standings but I don't know who most of the players are now. (pretty much the last roster move I remember was trading away Anson Carter, which bummed me out at the time). But now I happen to have cable, been enjoying getting to see the Sox instead of just hearing them. So I'm really looking forward to catching up on the Bruins and following them again - even if they are the least promising of the 5 local teams!