The reason why blender is easy to you is that is what you are use to. It is the same for any software. You will prefer what you are use to.
I personally find blender extremely difficult and prefer lightwave by Newtek.
So boils down to deciding to take the plunge and get out of your comfort zone to learn a new program.
Any program that benefits you is worth its salt to learn.
the point is, would you recomend gimp to begin with? i guess it has an easier learningcurve.. but is it simular to PS?
As my last sentence suggests it may be worth your time to dig deep and go for Photoshop as it provides more for you. The more a program offers the deeper the learning curve.
So yes you could get along with any editor, but how much time learning that program cpu have been put to learning Photoshop.
Sooner or later the easier program will fall short. It is just a matter of when.
So really the only one that can answer how's much time and money you are will to spend is you.