Waze does a much better job of accounting for traffic than cabbies. It's true that sometimes cabbies will drop you off at a better door - is that worth 30 pounds?
I don't think that is necessarily true. I often commute 40 miles on relatively quiet roads, and then at the end of that another 10 miles on one of the busiest roads in the country. When I leave home Google and Waze both underestimate the delay caused by the fact that the busy road is gridlocked by the time I get there. I am therefore better than Google and Waze at calculating journey time.
It's not worth that to me no, but saying that Waze/Google are better than a human is a different thing and I doubt that's the case. I think like many problems, doing this well generalises to Artificial General Intelligence.