There are plenty of shortcuts available in Pro Tools.  But the question arose recently when I thought to myself:

For example there are half a dozen plug-ins that I use quite often, some I use multiple times a day.  On my Mac, I know that I can assign any plug-in I want to show up in a "shortened list" of sorts, when I click the "AudioSuite" menu.  So, instead of clicking AudioSuite > Other > Normalize.  I can have the Normalize plug show up at the top of the window when I click on AudioSuite, by simply holding down the COMMAND key and clicking on the plug-in...this will assign it to the short list.  

To do this:

Click AudioSuite > Other > then hold down Command and click the Normalize plug-in you want to show up in the list.  Now, when you click "AudioSuite" next time, it will be at the top of the list!  This saves a bit of time.

There is a site called "ProTools Dudes" and they have an easy tutorial on how to assign a HotKey so with just a keystroke, your desired plug-in will pop up.  

NOTE: On my Mac, I decided I wanted to create a "shorter" shortcut for Gain & Normalize.  Because some keys combinations are already used for things in ProTools, I did find that the following worked perfectly.

GAIN: I hold down Control and the number 1 on the Alpha Numeric keyboard 

Normalize: I hold down Control and the number 2 on the Alpha Numeric keyboard

Learning and creating shortcuts in Pro Tools, or any DAW, is such a time saver and just makes sense....take time to make your workflow smoother!