The Find/Change feature of InDesign is ridiculously powerful. Most people only use a fraction of its capabilities. There are four types of searches: Text, GREP, Glyph and Object.
A Text search is most common. Find a certain word or phrase and replace it with another. But by using the boxes at the bottom of the screen, you can also search by how the word is formatted and replace with a different format.
The GREP find/change in much more complex. It searches for patterns. So if you want to find all phone numbers in a document and format them the same way, GREP search is for you.
A Glyph find/change lets you isolate a specific character. Helpful for locating or altering of random bullets.
But the Object tab is the one that gets the least attention and it's the most powerful. Find and change the formatting on shapes, lines, text boxes and more. Find all boxes with a 1 pt. line and replace with a 2 pt. line. Find all shapes with a drop shadow and remove them. Powerful stuff, and most people have no idea it's available to them.
If you are working with long documents, Find/Change will save you a ton of time.