CS2 comes with many improvements over CS:GO that make navigating around it more convenient for the average player. Many of these features are available via the game’s menus, but for accessing everything at once, the console is your best friend.
Many Counter-Strike players don’t even use the game’s menus: once you discover the CS2 console, you may find that it’s easier to input a string and a value to immediately run commands or change a setting.