I enjoy Blender, but it's a specialist application with a highly complex, mostly unintuitive user interface that requires training and has a steep learning curve.
When people start using Blender, they generally start with a written or video tutorial series and are prepared to put in hours to get productive.
I'm sure Blender's UI is fine for what it does, but it's certainly not any easier to use than e.g. LightWave/Modo/Cinema4D was, and arguably harder.
Are people really saying GIMP is somehow harder than that?