It’s not only popular but it’s a powerful tool too, I have been using photoshop for 4 years, its pretty amazing, if you have ideas and skills to use it, you can probably turn up any image into graphical pictures.
I myself have been a graphical photo editor, I used to design passes, logo, banners, pamphlets much more on it, moreover as I knew graphical editing, I could turn any usual sketch into Highly lucrative graphical one, it has a good demand in industry too, moreover the Adobe community is popular n powerful too with loads of featured tools. Highly suggested, if you want to go through learning curve.