Whenever you use the commandline a lot, you will be browsing to certain directories a lot. Most graphical filebrowsers offer some sort of bookmarking system. So that you can browse to the place where you have your invoices with only two clicks, instead of clicking all trough Documents » Administration » Finance » 2012 » 01.
Bash has something similar, but as always with the commandline, more powerfull: CDPATH.
I have several CDPATH entries set, for example on my desktop machine:
And on my webservers:
The first, for example allows me, regardless of the current active directory, to type
cd <tab> to show all active projects. Typing
cd MCD_<tab><enter> will expand to the project
cd MCD_my_current_drupal and open the directory
One of those tiny settings that make a small thing a little more efficient. And because I type that several hundreds of times each week, it's overall benefit is rather large.