When in command mode, you can grab the word that is under the cursor. Makes search and replace for those long function names painless.
C-r C-w
The other little trick I didn’t know about until I accitently brought it up was the command history. This subtle little thing makes a huge diffrence. You can use normal vim movement keys to edit the commands, and when you are done just hit <enter< on the line and it will execute it.
q:
Of course you can do the same thing with search.
q/