Well, you can use it to do just about any repetitive task that is a series of mouse clicks and/or key strokes.
I've been converting my old record albums to digital files and I use Magix Audio Cleaning Lab to eliminate the clicks and pops. The worst clicks have to be manually edited out, so I need to do the same commands over and over again.
To zoom in, I need to hit the + sign 8 times. So I have a hotkey to send a + sign 8 times. One keystroke instead of eight
Then to cut out the click I wrote a script to 1. move the mouse to a certain spot and left-click 2. move the mouse to another spot, click and drag to 'here' 3. move the mouse again.
That's one the best things about AutoHotkey, you can move the mouse cursor to anywhere you want and click or click and drag, etc.
I had something else where I needed to copy some text from one application to another. So it was - activate window 'A', go 'here' and highlight the text, do a ctrl-c, activate window 'B', go 'here' and do a ctrl-v. Then do this same thing 10 times in a row.
I had something else to copy the text in a tooltip pop-up to a text file. The possibilities are endless.
The other thing I like is you can post a question to the forum and it will be answered quickly. Here's a list of scripts that other people have written.
http://autohotkey.com/forum/viewtopic.php?t=3284