I don't want to derail this interesting topic, but I did want to respond to Brad's post...
I think a lot of people are overwhelmed by the sheer amount of choice (and expense) of a European trip. It's much easier to just follow a itinerary that has been set and vetted by someone with 20+ years experience. And sometimes it just makes good sense. For instance, my dad and I are going to Rome and plan to follow the "Caesar Shuffle" (Colosseum to Forum to Pantheon) because our hotel is near the first and we want to have lunch near the last.
That said, I do encourage people to restructure them to suit their own tastes. Rick certainly has his own biases (case in point: I didn't enjoy Blenheim Castle in England at all, which is one of Rick's favorites or at least used to be). But I think being able to pick and choose is a skill that, for most people, comes with the experience of getting at least one European trip under their belts.