I like using CRTL+L to clear. It's nice because you can have a command typed out and still be able to press CTRL+L to clear the screen and keep the command typed out.
Oh god I also do this... See the comment below, I ran history|cut -d " " -f 5|sort|uniq -c|sort -nr|less on my personal laptop, my third most commonly used command (behind ls and cd) is just typing in nothing...