To those who won't because you're not getting paid- for some, time is valuable. If I can be out of there in less than half the time it would take for someone else to check, then I'm doing it.
To those who won't because it affects our workforce, well, how noble. Just understand this: People who want to work will always find a job, and times are steadily changing regardless if you use the self-check or not. Is it really just an excuse not to?
Myself, sometimes I do, sometimes I don't. It depends on a few factors. 1. How many groceries do I have? 2. Do I have a lot of produce? I hate scanning produce! 3. Are there people checking that I like visiting with? This is a small town, and most of us like getting to know each other. Sometimes I'd rather wait a little and have a nice conversation.
As another member pointed out, this is truly a first-world problem. Before complaining, we should be thankful that we can go to the store whenever we want, and buy whatever sounds good at the moment. The vast majority of people in the world do not have this luxury.