LED digital watches arrived at my school in 1974/75. LCD watches arrived about a year later.
>Headphones were giant things you used in the basement to listen to Pink Floyd.
I had a pair of 424s in 1975. They sounded pretty good.
http://www.tonepublications.com/old-school/sennheiser-hd-414...
>There was no portable way to listen to music except transistor radios.
Like a lot of people, I had a battery/mains cassette player/recorder. It wasn't an iPod, but it would have done the job. It's more accurate to say there was no tradition of personal music players. In-car players were very common.
>Cashiers punched in all the prices by hand, but it was only a little bit slower.
It was horrendously slow. And every single individual item had to have its own price sticker - which often fell off, holding everyone up.
It's interesting how many of these simply haven't been checked or researched, just patched together to create an "It was better in the old days' narrative.
I don't remember it being better. I remember it being very different. Many things now - smoking bans, health awareness, the public Internet - are huge improvements.