There are things you just can\'t do faster with a GUI then with the CLI.
I want to share those things with you, and I hope you want to share your thing with me.
I use Tilda(http://tilda.sourceforge.net) for my terminal word, with the F3 keybinding, so I always have a terminal at hand. This is just a list of my favorite commands, it is not a list of the best commands. If you know others, then please leave a comment, I like it.
sudo apt-get install or urmpi or yum are just faster ways then start up synaptic/yast/control centre, type your password, wait for it to load the package list and then find the software and then click install, confirm and then wait for it to be installed.
This is if you know the package name, but Linux Mint has a nice feature for that, named apt search [search]. I do not know how it can be done in other distro\'s, but I like the feature.
also wgetting a .rpm/.deb package and then rpm -i or dpkg -i is faster then opening up your FM, browse to the folder (cd) and then click the package, wait for it to load, click install and type your password.
It is also much more convinient to do ALT+F2 gedit/firefox e.d. then opening op the menu, search for the app and then click it. Again, this is faster if you know the name of the binary. (In Mint you can search trough the start menu ^.^).
(Note that ALT+F2 is the same as typing it in a terminal).
What do you prefer, opening up your FM, going to the right partition, right click, navigate to the right tab and wait for the info to load, or just to df -h and have the space info you want? And as a bonus you get all the partitions.
I do not like opening up the system monitor to see how much ram I have free, I just like to type free -m (or -g for gigabytes, but i only have 512 :(. ). What do you think about top? Thats a lot faster then the whole menu stuff...
Maybe you want to kill a process? You maybe have a button on your taskbar, or maybe you ALT+F2 and xkill it, but I think it is much faster to killall it. (killall [processname]).
Or you want to shutdown? or reboot? (shutdown -h now, shutdown -r now, halt, poweroff, reboot, many choices for you...)
You want to make a directory? (mkdir) or make a whole directory structure? (mkdir -p [path/for/structure/here/without/brackets]).
Maybe you are on a server and you need to look up some info for a program, well try to get firefox on a server without X... Ever heard of elinks, w3m or lynx?
I hope this was informative to you, and if I forgot something, then tell me.