Unless you're involved with thinking about what you're doing, you end up doing the same thing over and over, and that becomes tedious and, in the end, defeating.
You have to listen to the people who have a negative opinion as well as those who have positive opinion. Just to make sure that you are blending all these opinions in your mind before a decision is made.
To me, the difference between New York and London is that things are boring and staid in London.