Wouldn't call the turning radius a design flaw, it's just not excellent like the toyotas. Going from my silverado to my frontier was amazing as far as turning radius goes. For me the only advantages to the Tacoma is it is a bit lighter and has the power receptacle in the back.
Its definitely a design flaw. Its horrible. What year was your Silverado? My '08 Z71 turned a lot sharper than my '09 Frontier (both 4 door 4wd std bed). It was actually easier to park too. It was so damn big that it barely fit in the spots, but it was more maneuverable.