I've had my new car for a few weeks now, and there's one feature that has taken time to get used to.
Instead of a key, I just have a key fob. As long as the fob is within a few feet (about a meter) of the car, I can press a button on the door handle to unlock it. And there is no ignition key slot, just a big ol' glowing pushbutton.
What's hard to get used to is leaving my keys in my pocket. For decades, it's been completely normal to reach into my pocket as I walk up to the car, use the key to unlock the door, slide into the seat, and then put the key into the ignition.
Now I have to leave my keyring in my pocket. It doesn't sound like much, but it's actually been very hard to do!
A weird side effect is that I will walk up to other locked doors and expect to press a button to unlock them. When I realize there's no button, I have to sheepishly get out my keys. Maybe I could find a way to make my house doors work without keys too!