To better understand highly complex flow features around gas turbine cooled blades, a numerical study that compares some of flow physics in rotating cooled and uncooled blades was done. Very fine grid system of over 520M cells which contains every heat enhancement feature such as rib turbulators, trailing edge slot arrays as well as cooling holes is used for the cooled gas turbine blade CFD analysis and for the uncooled blade, the same surface and volume grid quality are maintained. Vortices along with other essential flow variables were calculated and visualized using the Reynolds-Averaged Navier-Stokes equation closed by 2 equation K-w SST turbulence model. Primary and secondary vortices were observed both in cooled and uncooled CFD results however, vorticity in cooled blade overwhelmed in almost every flow region over that of uncooled blade due to high speed cooling flow discharge and mixing.