Background:  B.S. in Civil Engineering and a B.A. in Architectural Studies

I am currently working as a civil engineer and I know that I do not want to remain at my current job forever. However, I could wait and earn my P.E. before returning to grad school. Do any landscape architects/architects/urban designers out there know how useful a P.E. would be in the design world?? Am I dreaming of a road towards my own practice or just putting off grad school debt?? 

I  was accepted into UPenn for MARCH/MLA starting this fall. If the financial aid package had been a package at all, my bags would already be packed...