I keep trying to use Gimp, I find it's just tedius to use compared to Photoshop. For example in Photoshop you can paste something, it creates a new layer, you can select it, resize, rotate, skew all in one go in real time. You can't do that in gimp, you paste it, but it does that weird floating layer thing, so you have to right click and go "to new layer" or something like that. Then it also does not have an alpha layer, so when you erase it's just the background colour (ex: white) instead of what's behind, so you have to right click on the layer and add alpha now. Now you want to resize, ok you can do that, but you can't rotate or move it at same time. The grid thing makes it hard to see too. All these extra steps. My favourite Photoshop version is 6.0, it's simple yet very usable. I always end up finding myself going back to that for any serious work, but then I have to fire up a vm, so it's kind of annoying.
Same with CAD, there does not seem to be any decent Linux CAD programs so I always find myself going back to Autocad 2000. The most well known CAD program in Linux is FreeCAD I think, but you can't just start a line, and type a number and it becomes that lenght. You have to actually manually make it the size you want. Just that alone can be the difference between whipping up a plan in 10 minutes, or an hour. There's lot of shortcuts and other stuff you can do in AutoCAD that is just more intuitive. I don't imagine a general purpose CAD program is that hard to make, so not sure why Linux can't be better at it. I've tried to use Blender for CAD, but one thing I find annoying about Blender is it's hard to be precise with stuff, it's not really made for that I guess.