Bold Ctrl+B, Italics Ctrl+I, Underline Ctrl+U. Want to save? Ctrl+S. Want to print? Ctrl+P. Indent? Tab. Left, Center, Right-align? Ctrl+L, Ctrl+E, Ctrl+R. Increase/Decrease font size? Ctrl+>, Ctrl+<.
You don't need to use the toolbar at all for common operations.