i am okay with this during the few instances where they do things in a better way than i would have. like utilizing some extremely rare/custom keybinds for certain tasks in IDEs. those experiences are eye opening and humbling.
most of the other times though, yeah it's pretty rough
In Windows, nothing. In Linux, if your DE supports it, you can hold down the Alt key and click anywhere to drag it, rather than using the title bar.
For middle click pasting: normally, to copy and paste text, you'd have to use Ctrl+c,Ctrl+v (or equivalent methods). Again, if your setup supports it, instead you can just highlight text, then middle click elsewhere to paste the highlighted text.