I won't root, it's my work and personal phone and can't afford an outage due to my own causes.
But it is my timer for cooking hamburgers
It is my shopping list (easy to add items on the fly, it's always with me)
It is my GPS, for fun more than travel but I like knowing how long before I get somewhere. I like the speedometer apps, the travel data loggers, etc.
Getting to like Google Voice, except when it adds the downloaded voice messages to my music folders and they play when I'm using it as a random song music player. And the messages aren't transcribed very well, but it's a work in progress and so far it doesn't hinder me.
It is my music player, and it works great, as does Pandora.
The apps let me find things in town easily. Had to switch hotels last week due to a power outage, took me 3 minutes to find another, call and get a reservation, and get a map to it.
It is my calorie counter and exercise buddy. As a geek trying to lose lbs, it satisfies my need for how many calories, how many I've burned, how far I walked, etc.
It is my alarm clock
IT IS MY PERSONAL VEVUZELA!!!
It is easy to add and subtract apps -
1] put on flight tracker app for a trip next weeki so I can keep track of delays.
2] all my wife's family's contact info is there so I have maps and directions to their homes from the airport
3] it is my movie theater when I'm flying
4] it is my game console to keep boredom at bay
And when I cruise this site I still find new apps to try and love or hate. Heck, I just learned about Launcher Pro and am loving it.
Like everybody says, it is what you make of it. Try the market anytime you have a challenge in life or see something in the world that interests you - and see if there is an app that embraces it. I'm amazed at what people have thought of already. Good luck.