ESPN is my suggestion to watch playoffs. As mentioned - get there early - I had no pressure to keep ordering food and drinks throughout the game - ordered a meal and a couple of drinks -
Another comfortable spot was a small lounge area over in Kidani. Not sure if there's a cover charge or anything, but the bartender is right there and can change the channel for you if no one objects.
I havn't been into the lounge area yet - but want to point out that kidani has one of the best community halls around & it's right across the hall from the arcade and around the corner from the store. From the lounge it's just up the stairs into the lobby and to the left past the library. Plenty to keep the kids busy (Wii, PS2s, Foosball, pool table, crafts &* button making) if they're old enough to go to the hall on their own.
We watched a Bulls playoff game in the restaurant at ESPN Wide World of Sports Complex. We were staying at the Boardwalk but went to the ESPN Club too late to get in. Wide World of Sports was a great backup, a lot less crowded and a great atmosphere. Former Bull Will Perdue was there that night. There is information about transportation and dining for Wide World of Sports at the Disney website.