Currently I am listening to a replay of a presentation about Project Risk Management by Frank Saladis having this quote on one of its slides: "Go slow now so you can go faster later". It reminds me of another quote I once heard from one of my mountain guides when going on some hiking tour: "The one who goes slow goes far."
Doing project management right means to have sort of a slow start since you need to do some planning and preparation upfront before you actually start execution of the project and creating the deliverables customers of your project asked for.
This means that for some period of time you do not work directly on those deliverables, you more work on plans and documents and processes and setting things up for the project. This exactly is the reason why projects are not managed well in an environment lead by people who do not understand the value of project management. When they see you doing your planning and all that stuff they quickly get real nervous and impatient and come up with questions like: "when will you start writing code for me ?"
A project manager needs to deal with that impatience, otherwise he or she won’t be able to do the job as project manager at all and what was supposed to be a project quickly turns into an adventure.
There is another nice saying about project management. There are two ways to do a project: plan and execute, or: execute, fail, plan and execute.