I have used inkscape though it has been some time. I felt as though it was not super featureful at the time so the UI felt slightly barren compared to something like Adobe Illustrator, but I don’t recall having the same kind of trouble with it that I do with GIMP honestly.
That’s a good question, I’m not too sure since I work in IT/Software as well and am currently using kakoune. I think a lot of efficiency upgrades in other industries are typically a cost gap instead of an understanding gap. For example, a carpenter could start out with a tool like a hand saw, and then later upgrade to a band saw, but they need to pay a lot more for and find space for the more efficient tool. This can kind of exist in software as well, but the funny thing is that a lot of the time these days I find the FOSS stuff better overall, which I think sets this phenomenon apart from other industries and whatnot.