I encounted this article from Nacy Ratey, who is certified coach from Harvard University, I think she pointed out the essence of the benefit you can get from a life coach:
pay attention to goals long enough to complete them.
learn ways to self-motivate and stay on task.
develop strength-based structures in your life to help you stay on track.
develop rituals and routines that you will use and stick with.
use feedback more effectively.
be a better self-observer.
make lasting changes in your life.
learn to live a more balanced life.
develop strategies to follow-through on projects.
learn to measure and to use time efficiently.
be more effective in your personal, academic and/or professional life.
identify barriers to progress and strategies to move past them.
be a better self-advocate.
learn how to minimize your challenges and maximize your strengths.
decrease self-blame and low-self esteem.
stop procrastinating and be in action towards identified goals.
be more proactive and less reactive.
live a richer, fuller life.