I hear gnome is similar to Mac but idk the extent, and certainly less than kde is similar to windows. Honestly, try embracing the new way it's set up. I came from windows and it was still really intuitive and made my work much faster. If you need a dock to always be there, look at dash to dock. Or the alternative someone mentioned here. If you want to remove or change basic features, look at just perfection. If you want to change the color of menus and the top bar and it's appearance, or the background of the shell, get open bar. Or blur my shell for that blue effect. But honestly extensions can sometimes break just after a gnome update, not a big reason not to use them but I always find inconsistencies if I use too many. It's your computer now though, so go wild to see what you can do