The Photoshop Camera Raw plug-in is most popular among professional photographers in North America followed by Adobe Lightroom and Apple Aperture. The photographers who are using Lightroom or Apertures are still having Photoshop.
While Aperture is Mac only, Lightroom is available on the both Windows and Mac. Lightroom vs Aperture
John – The vast majority of photographers seem to understand pretty clearly the different nature & roles of the apps, and they continue to view Photoshop as a must-have part of any serious arsenal. Link.