I love my cellphone! No, it's not attached to my ear, but I do call my cousin/best friend about 2 times a day. We live three hours apart, and never get to see eachother, and we always have so much to talk about.
I do NOT take it to work though. I do NOT talk on it if I am in line waiting to get to the till. etc etc etc.

I don't see a problem with them as long as you keep your voice down, and you keep it on vibrate in public places. If someone is going to need to talk to you (cashier, etc) then say "Hey I will call yah right back." Obsessing is not a good thing.