I do not have Sky yet (getting it next month), but my husband and I did a house-sitting job for his boss while she was on vacation, and she had Sky. I don't know what channels are good or anything, and I tend to think a lot of the programs here are, as they say, naff. But, you said you aren't much of a television watcher in general, so some of my favorites that are on TV are:
-Jeremy Kyle (it's fun to watch him yell at scummy people; it's like a Jerry Springer type of show. Conflict resolution/confrontation show)
-Hell's Kitchen (it's fun to watch him yell at bad chefs. Basically a reality show where aspiring cooks compete in cooking competitions and dinner services. Last one standing gets a prize of some sort)
-Dragon's Den (Inventors/product designers/business people pitch their products and businesses to five investors, who grill the pitchers and decide whether or not to invest or not)
-Three in a Bed (Three couples or individuals who each own their own bed and breakfast spend a day staying at the other couples' bed and breakfasts. The bed and breakfast that earns the most money from the competition wins)
Yes, it's true, all of these suggestions are reality shows. I didn't realize how much I liked reality TV until I moved here. It seems like anything that isn't reality TV over here is either Doctor Who, a singing competition, or a soap opera. Yes, I do believe British television sucks cuss word.
However, with all this said, Sky is GREAT for films. They seem to really show a lot of them, and after a movie has aired, it goes to a section called "Sky Anytime" (this is what my husband is telling me). Here, you are able to watch any movie they've aired recently. And during my time of house-sitting, there were A TON of them. Really good ones, too. It had a great mix of old movies and new ones.
So even if you aren't much of a television watcher, consider yourself lucky. I was very impressed with Sky. 1000 times better than BT Vision, which is what I have now.