The Sketchup toolbar is nice at first, but moving the mouse from the drawing area to the toolbar and back becomes tedious and needlessly takes your eye off your work. To save time, I forced myself into the habit of using the keyboard shortcuts (hotkeys) provided, and I'm glad I did.
Here are the Sketchup toolbar keyboard shortcuts from the Sketchup menus. You should memorize the frequently used at least, if you haven't already. I wish there were more, but these definitely speed up the process for me.

Note that these are one-key shortcuts. Just press the letter key, no Ctrl, Shift, Alt or Option. Easy, fast. With a little practice, using the hotkeys becomes an automatic, almost thoughtless step.
Frequent:
Others: