Yeah I use GMS2.3 now that it's free(for non-commercial use)! Happy I can finally utilize awesome assets like Input, Scribble, Horror-Fi, and many more! Best decision YoYo Games made in recent years.
Absolutely! Also check out Post Processing FX by FoxyOfJungle. It's quite literally one of the best post processing assets out there, even more so than a lot of Unity and Unreal assets, and it's only available for GM! :)