Am I the only person left on the planet who believes in manners?

I’ve noticed people seem to use their lap tops, or nook, or cell phones, everywhere they go these days. Whether they are visiting or being visited.
I remember when it was considered rude to pick up you home phone and hold a long conversation when you had visitors. Now, everyone seems to do that or worse. Text, call on their cells, use their tablets to see movies or shows, or to read, or play games. What is the point in visiting people if you go there to ignore them? Or go on vacations. The best vacations I ever have had was when I was disconnected from phones and televisions. Actually spending quality time with the people I was with.
I don’t understand how a person plans to make memories if they are involved in things that distract from the moment.
So am I all alone in believing these things are rude?