Interesting thread - it's a subject that flickers through my brain from time to time.
Some of you have already mentioned auto-bill-pay, rewards CCs and such. Agreed, also chrome/chromium browser. I'll add switching to Linux/Ubuntu/Xubuntu to that (though I still have my DW's Mac in the house as a 'back up' for a few things that only rarely pop up that I can't handle).
Funny thing is, most of the non-internet kinds of things like this, that we really, really appreciated are pretty old now. Some are:
1) Electric Garage Opener - Going from no garage in a townhouse to a garage in a SFH was a step up, having to get out and open a door seemed like nothing. I think it was when DW was pregnant, that it seemed like a good idea. Man, not having to stop the car in a snowy driveway on a pretty steep slope, get out, open , get back in, back up the car to get a running start.... it was great! No going back.
2) A Humidifier attached to the furnace, with automatic humidistat. Dry air in winter can be real problem, but filling a stand-alone humidifier, having to clean it and worry about mold/slime, and then - they never really worked all that well. With the control so close to the source, it was hit-miss. The one on the furnace flows water through a drain, so it is always flushing out build-up when it is on. And the humidistat works near perfectly. Set it and forget it. Glorious! No going back.
3) Touch tone phones!
I guess a few more recent things would be GPS, and for us, VOIP phone. That really cut our bill, and no more worries about which area code we are dialing, etc.
I'm surprised no one mentioned ebook readers, seems like lots of fans here.
-ERD50