It's been over 24 years for me since I've used GIMP for the first time and the only problem that I had was always with GUI ergonomics. You had to understand everything anew after being more accustomed to proprietary software pieces. My friend never adapted to anything else but Photoshop - even Krita is beyond her abilities.
Nearly every discussion regarding GIMP on hn will include thread about the name 'problem' and this is getting tiresome. The name won't change and those who feel offended should focus on problems whose solution is genuinely productive.