Most have been mentioned. As someone who used to travel for weeks with just a carry on, and didn't own more than could move in a car, the AT thru-hiker's example is dead on.
I don't use, or miss, social media. Instead of deleting my Facebook, I deleted all of my friends. There are loads of pics I need to transfer at some point.
A few things I do not use are a bit extreme. I do most of our laundry by hand (heavy towels and blankets are the exception.) Myself, elderly mom and busy 12 year-old. We've started to replace clothes as they wear out with lighter layers that wash easily and hang dry quickly. Electric bill is way down, uses less water, and waaaay cheaper than a laundromat or replacing aging washer.
Boil all water in electric kettle, save in giant Thermos for use during day.
Restaurant meals. Moved to small town, and the options are disgusting.
Computer, 24/7home internet, smartphone, cable, etc. are not used. Kindles and wifi, when available. (Library, pool, occasional pass)
Traditional lights at night. Kindles are great for reading. We all have headlamps, and good quality solar lanterns (battery back up)
Have an oven, but prefer the toaster oven for most use. Fast, cheap to use, easy to clean.
Have been car free in rural area. Could do it again, but 12 yo has a lot of activities requiring rides, and I have a few health issues. We have one,small older beater car, and drive just under 2,000 miles a year. I used to be a big time road tripper, and new SUV lover. Occasionally, I miss both, but the feeling passes.
Could go on, but you get the idea. :)