Autocad MEP Tips and Tricks for a class I am teaching at AU

I am teaching a tips and tricks for MEP and Navis at Autodesk University this year and I am looking for some feedback on really good tips user might have that they would like to share with the attendees. It is based on everyday designing and engineering and the things we have to do as "tweaks" and work-arounds to be productive and not frustrate the heck out of ourselves.

If you think you have a good tip or trick please add to the post and i will try to incorporate them into the class.

I will give everyone credit for there submissions in my presentation as well.

thanks in advance for the feedback.