I’ve actually always disliked Maya, as well as 3DSMax and Blender for the same reasons you listed: they’re more for video and game production than for modeling and design. All the same, if you do want to do organic modeling, they’re some of the best programs.
Of course, you don’t, so that’s irrelevant.
Inventor is pretty heavily aimed more at industry than hobbyists and small-scale designers, but I’ve found that it doesn’t necessarily mean it’s not good for the average user. It’s centered around assemblies, but it’s still extremely versatile with individual models and in general there isn’t much that you can’t do with Inventor that you could on another program (for geometric, mechanical parts at least).
Fusion is pretty similar but it seems slightly more geared towards individual users (after all, they released it for free for individuals and small businesses) while not sacrificing the industrial aspects of it. If you haven’t taken a look at Fusion, I’d highly recommend you do so.
As @DesignGuyJared mentioned, Sketchup is also a good option. I’ve never found it to be quite as flexible or versatile as Inventor or Fusion, but I’ve seem a lot of cool stuff come out of it and it certainly is a tad easier to use. Unfortunately, as far as I can tell it can’t do much in terms of assembling multiple pieces (though maybe that’s only because I never got deep enough into it).
The problem is there aren’t many “complex” 3D modeling programs that are aimed specifically at 3D printing in general. A lot of these programs were built through years of refinement by the company, such as Inventor which has been around since 1999, and through the earlier years they were built with the intent of using traditional manufacturing (CNC, injection molding, etc) to create prototypes. When more 3D printers started showing up, some of the programs started incorporating 3D-printing specific features (such as Inventor’s 3D Print studio), but since 3D printers honestly don’t need much on the part of the CAD program other than exporting to STL, there was really no reason to change too much in the programs. A lot of the best programs for designing 3D printed parts are the exact same ones you would have found a decade ago that industries used for CAM.
I wouldn’t get discouraged by a program aimed at industry or not incorporating enough 3D printing specific features. After all, some day in the future you might be able to apply your familiarity with them in something big
-Karl Zhao