I've been an ardent IntelliJ IDE user for a long time now. IntelliJ IDE provides ample keyboard shortcuts to help programmers write code fast. Below shortcuts are the top of my most used list.
Ctrl + Shift + Enter
This shortcuts lets me quickly puts the cursor in the new line, even if my cursor is in the middle of my current line. While I mostly uses it to move the cursor to the new line, this shortcut is more advanced than that - it can complete the current statement and place the cursor in the next possible edit.
Ctrl + y
Removes the current line.
Ctrl + Shift + E and then Ctrl + Shift + E
The first shortcut shows me the recent location of my cursor and when I press again it filters and shows only the recently edited locations. Once I learned this shortcuts, my mouse usage has come down drastically.
Ctrl + E and then Ctrl + E
Similar to the above shortcut, but it shows the files instead of locations.
Ctrl + Shift + A
I can control anything on the IDE basically using just this one shortcut. Search for the settings / action that I want and run it. Switching theme, toggling word wrap, building projects, solving world hunger - anything you want.