I made this thread because researching apps failed, if you look on the internet about how apps have changed the world etc, majority of the articles happily start with positive comments like "It allows us to access information", "a new way to communicate" and "made our life easier", but then starts talking about games and social networking instead of explaining itself, seriously do a search and you will see what I am talking about, it describes the internet and somehow allows mobile apps to take the credit :S
For me it has changed the world, but in a subtle and transformative way.
Most of my waking life I already have access to a computer. I work in front of a computer all day, and in the evenings I spend a few hours on the computer for entertainment and communications. So simply adding another computer to my life does not really do much and has the potential to take much away.
The key features are that the benefits are subtle. I don't usually need navigation to drive to the places I normally travel, but it is nice to know about traffic problems without waiting for the radio to list them. I don't usually look things up online but it is nice when I am at the store that I can scan the barcode and instantly comparison shop; I can check if the product has a one-star rating and another has a five-star rating, or I can check to see that the price is reasonably close to other stores. (I still buy when the price is reasonably competitive.) When I go to a craft store I can visit their web site and get the 50% coupon while I wait in line to pay. On the rare occasions that I make a big purchase I can transfer funds immediately so I don't forget at home. I always have my music library with me through the cloud, or can turn on Pandora even when driving home.
The tablet (with a keyboard) is nice because it serves as a nearly full-featured laptop. I can remote desktop when I need something more. It is smaller and more portable than a laptop, and when needed I can pull off the tablet and still take notes in meetings without it being the same distraction as a laptop. Sure I'm usually using SuperNote or a similar notebook app rather than a faster keyboard, but it is less hassle than a notepad and pens, and I can email my notes to myself or to colleagues, or take pictures of the whiteboard, or whatever.
When it comes to entertainment I can turn on NetFlix in any room of the house rather than needing to sit before a computer or the console-connected TV. When I am waiting for a doctor appointment I can open to a game if I want, or I can check my email, or be productive for those few minutes if I choose. Much better than thumbing through a year-old copy of Fitness magazine that hundreds of sick people have also touched.
There was a time years ago when I hauled a planner around with me. Now I have all that information on my phone. If someone hands me a paper (which I would sometimes lose) I just scan it and hand the paper back. This works extra-well when getting business cards since it can scan the card to create or update contacts...the same contacts I use on my desktop. If it was some other important paper Google can scan it and convert it to a document to use, or I can leave it as an image and discard it later. Nearly everything I needed from a planner is handled easily by the phone.
Then there is the ease of looking things up while out doing things. I can type in a search to find movie times or look up facts and figures, then put it back in my pocket.
There is no grand feature for me. Most of the time it sits quietly in my pocket, i am not one of those constantly looking at the screen. Instead it is a smaller transformation of having the computer instantly when I want it rather than me going to the computer.