Normal everyday things that seemed like magic when they came out

Smart light bulbs.

I've got my bedroom lights set to come on a very dim orange 15 minutes before my alarm goes off, then a bright yellow when it does go off, then daylight white 15 minutes after.

All the lights in my apartment turn off when I leave and when I come home they're a gentle pinkish white color that turns into a dim gold at 10:00 p.m. and then an even dimmer candlelight effect at midnight.

I don't know how I lived for decades with regular lightbulbs.