That's ridiculous. You can use the line tool, the square tool, the circle tool, etc.
Take this thing from pixeljoint for example:
For the base of the statue, do you really think he pressed he mouse button like 100 times so he could draw a line? For the buildings, do you really think he pressed his mouse button 1000 times?
http://www.foolstown.com/pix/isowip.gif
Or this. O.O