I am proficient in photoshop as well, albeit nonprofessional. That being said, GIMP on its own is realllly hard to use after coming from PS. But with photogimp it’s a ton easier. I wouldn’t say it’s quite as good, but it’s pretty close. I’d give that a shot, at the very least.

I’ve also mentioned this before but for those that need a more photoshop-like GIMP experience, try taking a look at PhotoGimp, it’s essentially a reskin+remap of all of the hotkeys to more closely match those of photoshop, and it works wonderfully.