It's about being able to quickly automate away any thing that either annoys me or that I think it would be cool if it could be done. Some things I've been using Tasker for:

1. "Quiet hours" before quiet hours were a part of Android. I had a task that automatically reduced the volume levels for calls, notifications, etc. between 00:00 and 06:00. I've recently updated it to also go full volume if a certain number is calling.

2. Automatically turning wireless on/off when I'm entering / leaving home.

3. Automatically silencing / unsilencing phone when entering / leaving work (at previous work I used NFC for that, currently I use geofencing).

4. Adding custom voice commands to Google Now (I'm playing with it right now, as I finally found a way to make it work with my Bluetooth headset only a day or two ago).

5. Overriding media buttons on headphones, making them do other stuff.

6. I'm making my phone much more chatty right now - whenever I have a Bluetooth headset connected, it starts to tell me stuff via TTS - it reads out important notifications, tells me when I'm transitioning into/out of a geofence, occasionally tells time (yeah, too lazy to look at my watch), etc. I'm adding more stuff at the moment, with the intention of turning the phone into information awareness device.

7. Some time ago my SO wanted me to remind her stuff regularly via SMS; I eventually made a Tasker script that auto-assembled a message out of randomized components (to make it sound natural) and sent it to her. (Yes, she eventually started to suspect it's automated - I think because the reminders tended to come perfectly on time, or even during phone conversations.)

8. Orgzly is an application I use a lot (because I run my self-organizing in Emacs & Org-Mode). It doesn't auto-sync and having to select "Sync" from menu annoyed me a bit; I wrote a Tasker script that automatically opens the app and clicks in the menu for me every morning (still tweaking it due to issues with lockscreen).

9. Quick remote actions. I have a task that automatically opens a SSH connection to my VPS (via JuiceSSH) and executes commands.

10. IoT. In our Hackerspace, we've set up lights to be controllable via an API. A friend made me a Tasker overlay (yes, you can design UIs in Tasker) that could be used to turn the lights on and off.

11. I've just made myself a control panel for my IRC bot. The use case is this: sometimes people from our Hackerspace want me on the channel ASAP for some reason, and they notify me about it via Pushovers sent from my bot. Logging in to IRC while on the go isn't exactly convenient, so I made a popup control panel, accessible with a homescreen shortcut, that provides me with a text field and a series of canned responses that I can use to have my bot tell them something in my name.

12. When I was in China on a business stay, every day we'd catch a taxi to take us to the company. Since taxi drivers in Shenzhen don't understand any English and can't really read latin alphabet, we used to show them the photo of the street sign with an address. Taking out the phone and finding that photo was annoying, so I got one local to say the address out loud, recorded it, and then made my Pebble activate a Tasker task that would play the recording out loud - this way I could press a button on a watch twice instead of having to pull out my phone and find the image.

13. Speaking of Pebble - I used to forget to note down work entry/exit times in China. I realized that I always think about it while I'm riding an elevator, so I made a quick Tasker logger and hooked it up to the Pebble.

The common thread in all of these is getting rid of trivial annoyances and quickly adding some features to the phone. For half of these you wouldn't probably even find an app. Tasker to Android is like Bash scripts to Linux - when you learn it, you suddenly start using it all the time for fixing stuff and implementing random ideas. It turns your device into a tool. Yes, I do the same 7 things you do on my phone, but I know that if I want to do something else - like e.g. manage a server or an on-line service - I can make it happen.