Quick Comment

I highly recommend using SolidWorks' Comment feature.  Besides the obvious uses, I've found it really helpful in assemblies.  The nice thing about comments is they always show up when you hover over a part (or feature) that it's attached to, even if the item is suppressed. 

When you start an assembly many people give their parts descriptive names (hinge block, door handle, etc...), then your parts get assigned part numbers and now it's difficult to find those parts. If you add comments to the parts with the descriptive names then you'll be able to find them easier. 

Changing your Tree Display (RMB at the very top) and turning on deceptions will also accomplish this.  However, you may have to make your tree bigger to find what you're looking for and you have to have the description field filled in.

Both these techniques will work.  Choose the one that fits you best.