If you want to use gimp as an ALTERNATIVE and go in without the bias, you’ll likely learn your way around a LOT faster.
I think this is the key phrase – do you want an alternative (where you might have to learn new ways of doing things), or do you want a clone? GIMP is not a clone, but an alternative.
I also think this gets to something I was told loooooooooong ago, when I was a young lad asking what was the best computer to buy. Someone told me, “Find all the software you want/need to run, and get the computer that will run it all.”
In other words, if you need to use Photoshop, then maybe you don’t use Linux – maybe stick with Mac or (shudder) Windows.