In my opinion there is.
In Photoshop you can attach dropshadows (layer styles) to layers. This will save you a lot of time when something changes. I used Photoshop and Gimp. I can create the same images in Gimp but it just takes a lot more time. For hobby that's ok, but for work it's not. Thats why people are willing to pay a lot for Photoshop.
One thing that is bothering me in Gimp is that there is a layer size. Seems like a minor thing. But these are the little things that get in the way of working quick.
