Alan and I recently got a Sky box-- we actually did it for the cheap broadband (when we did the math, we figured out that the full Sky package, including HD, broadband and phone, is about £30 a month less than we normally spend on phone and broadband). To my surprise, it has actually changed my viewing habits. Before getting the box, we would usually have to make decisions over which TV show to watch in the evening if there were two or three on at the same time, and also, since videoing is such a pain in the neck, we'd often not bother videoing a programme if we were going out if it wasn't something we absolutely had to see. Now, though, with the box, we can record two programmes and watch a third, so suddenly our TV viewing has expanded exponentially, even though we don't actually watch much that's on the channels we're paying for.
This, along with our DVD player packing up, has cut into our film viewing activities somewhat-- but since we've gotten complimentary tickets to the London Sci-Fi Film Festival (comprehensive review post coming next week), I should be making up for that this weekend.